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20 vulnerabilities found for LibVNCServer by LibVNC
CVE-2019-15690 (GCVE-0-2019-15690)
Vulnerability from nvd – Published: 2025-01-24 17:53 – Updated: 2025-01-24 18:22
VLAI?
Summary
LibVNCServer 0.9.12 release and earlier contains heap buffer overflow vulnerability within the HandleCursorShape() function in libvncclient/cursor.c. An attacker sends cursor shapes with specially crafted dimensions, which can result in remote code execution.
Severity ?
8.8 (High)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| LibVNC | LibVNCServer |
Affected:
* , ≤ 0.9.12
(custom)
|
Credits
Pavel Cheremushkin from Kaspersky
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CVE-2019-15690 (GCVE-0-2019-15690)
Vulnerability from cvelistv5 – Published: 2025-01-24 17:53 – Updated: 2025-01-24 18:22
VLAI?
Summary
LibVNCServer 0.9.12 release and earlier contains heap buffer overflow vulnerability within the HandleCursorShape() function in libvncclient/cursor.c. An attacker sends cursor shapes with specially crafted dimensions, which can result in remote code execution.
Severity ?
8.8 (High)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| LibVNC | LibVNCServer |
Affected:
* , ≤ 0.9.12
(custom)
|
Credits
Pavel Cheremushkin from Kaspersky
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VAR-202006-1844
Vulnerability from variot - Updated: 2024-11-23 21:27An issue was discovered in LibVNCServer before 0.9.13. An improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c. LibVNCServer Exists in an infinite loop vulnerability.Service operation interruption (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.
References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5
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VAR-202006-1855
Vulnerability from variot - Updated: 2024-11-23 21:14An issue was discovered in LibVNCServer before 0.9.13. libvncclient/tls_openssl.c has a NULL pointer dereference. LibVNCServer To NULL A vulnerability exists regarding pointer dereference.Service operation interruption (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.
References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5
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VAR-201910-1737
Vulnerability from variot - Updated: 2024-11-23 21:09LibVNC commit before d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a contains a memory leak (CWE-655) in VNC server code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appear to be exploitable via network connectivity. These vulnerabilities have been fixed in commit d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a. LibVNC Contains vulnerabilities related to lack of effective post-lifetime resource release and initialization vulnerabilities.Information may be obtained. ========================================================================== Ubuntu Security Notice USN-4407-1 July 01, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
It was discovered that LibVNCServer incorrectly handled decompressing data. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2019-15680)
It was discovered that an information disclosure vulnerability existed in LibVNCServer when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15681)
It was discovered that LibVNCServer incorrectly handled cursor shape updates. If a user were tricked in to connecting to a malicious server, an attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15690, CVE-2019-20788)
It was discovered that LibVNCServer incorrectly handled decoding WebSocket frames. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2017-18922)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.1 libvncserver1 0.9.12+dfsg-9ubuntu0.1
Ubuntu 19.10: libvncclient1 0.9.11+dfsg-1.3ubuntu0.1 libvncserver1 0.9.11+dfsg-1.3ubuntu0.1
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.2 libvncserver1 0.9.11+dfsg-1ubuntu1.2
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.4 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.4
After a standard system update you need to restart LibVNCServer to make all the necessary changes.
References: https://usn.ubuntu.com/4407-1 CVE-2017-18922, CVE-2019-15680, CVE-2019-15681, CVE-2019-15690, CVE-2019-20788
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.1 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1.3ubuntu0.1 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.4 .
Software Description: - italc: didact tool which allows teachers to view and control computer labs
Details:
Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors and didn't check malloc return values. (CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055)
Josef Gajdusek discovered that iTALC had heap-based buffer overflow vulnerabilities. (CVE-2016-9941, CVE-2016-9942)
It was discovered that iTALC had an out-of-bounds write, multiple heap out-of-bounds writes, an infinite loop, improper initializations, and null pointer vulnerabilities
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VAR-202006-1850
Vulnerability from variot - Updated: 2024-11-23 21:07libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename. LibVNCServer Exists in a classic buffer overflow vulnerability.Service operation interruption (DoS) It may be put into a state. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
====================================================================
Red Hat Security Advisory
Synopsis: Moderate: libvncserver security update Advisory ID: RHSA-2021:1811-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:1811 Issue date: 2021-05-18 CVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 CVE-2020-14405 CVE-2020-25708 ==================================================================== 1. Summary:
An update for libvncserver is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
- Relevant releases/architectures:
Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64
- Description:
LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.
Security Fix(es):
-
libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)
-
libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)
-
libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)
-
libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)
-
libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.
- Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
- Bugs fixed (https://bugzilla.redhat.com/):
1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock() 1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak 1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size 1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference 1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS
- Package List:
Red Hat Enterprise Linux AppStream (v. 8):
Source: libvncserver-0.9.11-17.el8.src.rpm
aarch64: libvncserver-0.9.11-17.el8.aarch64.rpm libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-0.9.11-17.el8.ppc64le.rpm libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-0.9.11-17.el8.s390x.rpm libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-0.9.11-17.el8.i686.rpm libvncserver-0.9.11-17.el8.x86_64.rpm libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm
Red Hat CodeReady Linux Builder (v. 8):
aarch64: libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm libvncserver-devel-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm libvncserver-devel-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm libvncserver-devel-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm libvncserver-devel-0.9.11-17.el8.i686.rpm libvncserver-devel-0.9.11-17.el8.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
- Contact:
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.
References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5
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"data": "libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename. LibVNCServer Exists in a classic buffer overflow vulnerability.Service operation interruption (DoS) It may be put into a state. Pillow is a Python-based image processing library. \nThere is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n==================================================================== \nRed Hat Security Advisory\n\nSynopsis: Moderate: libvncserver security update\nAdvisory ID: RHSA-2021:1811-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2021:1811\nIssue date: 2021-05-18\nCVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397\n CVE-2020-14405 CVE-2020-25708\n====================================================================\n1. Summary:\n\nAn update for libvncserver is now available for Red Hat Enterprise Linux 8. \n\nRed Hat Product Security has rated this update as having a security impact\nof Moderate. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64\n\n3. Description:\n\nLibVNCServer is a C library that enables you to implement VNC server\nfunctionality into own programs. \n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information\nLeak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock()\n(CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n(CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n(CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could\nresult in DoS (CVE-2020-25708)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat\nEnterprise Linux 8.4 Release Notes linked from the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock()\n1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak\n1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS\n\n6. Package List:\n\nRed Hat Enterprise Linux AppStream (v. 8):\n\nSource:\nlibvncserver-0.9.11-17.el8.src.rpm\n\naarch64:\nlibvncserver-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-0.9.11-17.el8.s390x.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-0.9.11-17.el8.i686.rpm\nlibvncserver-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\n\nRed Hat CodeReady Linux Builder (v. 8):\n\naarch64:\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\nlibvncserver-devel-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-devel-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\nlibvncserver-devel-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\nlibvncserver-devel-0.9.11-17.el8.i686.rpm\nlibvncserver-devel-0.9.11-17.el8.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2021 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n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\n8A9MNz92TFY=uZts\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://listman.redhat.com/mailman/listinfo/rhsa-announce\n. ==========================================================================\nUbuntu Security Notice USN-4434-1\nJuly 23, 2020\n\nlibvncserver vulnerabilities\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 20.04 LTS\n- Ubuntu 18.04 LTS\n- Ubuntu 16.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in LibVNCServer. \n\nSoftware Description:\n- libvncserver: vnc server library\n\nDetails:\n\nRamin Farajpour Cami discovered that LibVNCServer incorrectly handled\ncertain malformed unix socket names. A remote attacker could exploit this\nwith a crafted socket name, leading to a denial of service, or possibly\nexecute arbitrary code. (CVE-2019-20839)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)\n\nChristian Beier discovered that LibVNCServer incorrectly handled anonymous\nTLS connections. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 20.04 LTS. (CVE-2020-14396)\n\nIt was discovered that LibVNCServer incorrectly handled region clipping. A\nremote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14397)\n\nIt was discovered that LibVNCServer did not properly reset incorrectly\nterminated TCP connections. A remote attacker could possibly use this\nissue to cause an infinite loop, resulting in a denial of service. \n(CVE-2020-14398)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399,\nCVE-2020-14400)\n\nIt was discovered that LibVNCServer incorrectly handled screen scaling on\nthe server side. A remote attacker could use this issue to cause\nLibVNCServer to crash, resulting in a denial of service, or possibly\nexecute arbitrary code. (CVE-2020-14401)\n\nIt was discovered that LibVNCServer incorrectly handled encodings. A\nremote attacker could use this issue to cause LibVNCServer to crash,\nresulting in a denial of service, or possibly execute arbitrary code. \n(CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)\n\nIt was discovered that LibVNCServer incorrectly handled TextChat messages. \nA remote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14405)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 20.04 LTS:\n libvncclient1 0.9.12+dfsg-9ubuntu0.2\n libvncserver1 0.9.12+dfsg-9ubuntu0.2\n\nUbuntu 18.04 LTS:\n libvncclient1 0.9.11+dfsg-1ubuntu1.3\n libvncserver1 0.9.11+dfsg-1ubuntu1.3\n\nUbuntu 16.04 LTS:\n libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5\n libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5\n\nAfter a standard system update you need to restart LibVNCServer\napplications to make all the necessary changes. \n\nReferences:\n https://usn.ubuntu.com/4434-1\n CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397,\n CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401,\n CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405\n\nPackage Information:\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5\n",
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VAR-201812-1202
Vulnerability from variot - Updated: 2024-11-23 20:47LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution. LibVNC Contains an out-of-bounds vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. LibVNCServer is prone to an multiple heap-based buffer-overflow vulnerabilities. Attackers can exploit these issues to execute arbitrary code within the context of the user running the affected application. Failed attempts will likely cause a denial-of-service condition. Versions prior to LibVNCServer 0.9.12 are vulnerable.
For the stable distribution (stretch), these problems have been fixed in version 0.9.11+dfsg-1.3~deb9u1.
We recommend that you upgrade your libvncserver packages.
For the detailed security status of libvncserver please refer to its security tracker page at: https://security-tracker.debian.org/tracker/libvncserver
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE-----
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https://security.gentoo.org/
Severity: Normal Title: LibVNCServer: Multiple vulnerabilities Date: August 09, 2019 Bugs: #659560, #673508 ID: 201908-05
Synopsis
Multiple vulnerabilities have been found in LibVNCServer, the worst of which could result in the arbitrary execution of code.
Background
LibVNCServer/LibVNCClient are cross-platform C libraries that allow you to easily implement VNC server or client functionality in your program.
Affected packages
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-libs/libvncserver < 0.9.12 >= 0.9.12
Description
Multiple vulnerabilities have been discovered in LibVNCServer. Please review the CVE identifiers referenced below for details.
Impact
Please review the referenced CVE identifiers for details.
Workaround
There is no known workaround at this time.
Resolution
All LibVNCServer users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-libs/libvncserver-0.9.12"
References
[ 1 ] CVE-2018-20019 https://nvd.nist.gov/vuln/detail/CVE-2018-20019 [ 2 ] CVE-2018-20020 https://nvd.nist.gov/vuln/detail/CVE-2018-20020 [ 3 ] CVE-2018-20021 https://nvd.nist.gov/vuln/detail/CVE-2018-20021 [ 4 ] CVE-2018-20022 https://nvd.nist.gov/vuln/detail/CVE-2018-20022 [ 5 ] CVE-2018-20023 https://nvd.nist.gov/vuln/detail/CVE-2018-20023 [ 6 ] CVE-2018-20024 https://nvd.nist.gov/vuln/detail/CVE-2018-20024 [ 7 ] CVE-2018-7225 https://nvd.nist.gov/vuln/detail/CVE-2018-7225 [ 8 ] CVE-2018-7226 https://nvd.nist.gov/vuln/detail/CVE-2018-7226
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
https://security.gentoo.org/glsa/201908-05
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2019 Gentoo Foundation, Inc; referenced text belongs to its owner(s).
The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.
https://creativecommons.org/licenses/by-sa/2.5 . ========================================================================= Ubuntu Security Notice USN-4587-1 October 20, 2020
italc vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in iTALC.
Software Description: - italc: didact tool which allows teachers to view and control computer labs
Details:
Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors and didn't check malloc return values. (CVE-2016-9941, CVE-2016-9942)
It was discovered that iTALC had an out-of-bounds write, multiple heap out-of-bounds writes, an infinite loop, improper initializations, and null pointer vulnerabilities. (CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 LTS: italc-client 1:2.0.2+dfsg1-4ubuntu0.1 italc-master 1:2.0.2+dfsg1-4ubuntu0.1 libitalccore 1:2.0.2+dfsg1-4ubuntu0.1
In general, a standard system update will make all the necessary changes.
References: https://usn.ubuntu.com/4587-1 CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055, CVE-2016-9941, CVE-2016-9942, CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681
Package Information: https://launchpad.net/ubuntu/+source/italc/1:2.0.2+dfsg1-4ubuntu0.1
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Failed attempts will likely cause a denial-of-service condition. \nVersions prior to LibVNCServer 0.9.12 are vulnerable. \n\nFor the stable distribution (stretch), these problems have been fixed in\nversion 0.9.11+dfsg-1.3~deb9u1. \n\nWe recommend that you upgrade your libvncserver packages. \n\nFor the detailed security status of libvncserver please refer to its\nsecurity tracker page at:\nhttps://security-tracker.debian.org/tracker/libvncserver\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org\n-----BEGIN PGP SIGNATURE-----\n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\ntqycmFiHaax09jHvqffRbwARfVrrrNbh4u/F7n3WWpbIsCjPOC4mI2\n-----END PGP SIGNATURE-----\n. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\nGentoo Linux Security Advisory GLSA 201908-05\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n https://security.gentoo.org/\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\n Severity: Normal\n Title: LibVNCServer: Multiple vulnerabilities\n Date: August 09, 2019\n Bugs: #659560, #673508\n ID: 201908-05\n\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\nSynopsis\n========\n\nMultiple vulnerabilities have been found in LibVNCServer, the worst of\nwhich could result in the arbitrary execution of code. \n\nBackground\n==========\n\nLibVNCServer/LibVNCClient are cross-platform C libraries that allow you\nto easily implement VNC server or client functionality in your program. \n\nAffected packages\n=================\n\n -------------------------------------------------------------------\n Package / Vulnerable / Unaffected\n -------------------------------------------------------------------\n 1 net-libs/libvncserver \u003c 0.9.12 \u003e= 0.9.12 \n\nDescription\n===========\n\nMultiple vulnerabilities have been discovered in LibVNCServer. Please\nreview the CVE identifiers referenced below for details. \n\nImpact\n======\n\nPlease review the referenced CVE identifiers for details. \n\nWorkaround\n==========\n\nThere is no known workaround at this time. \n\nResolution\n==========\n\nAll LibVNCServer users should upgrade to the latest version:\n\n # emerge --sync\n # emerge --ask --oneshot --verbose \"\u003e=net-libs/libvncserver-0.9.12\"\n\nReferences\n==========\n\n[ 1 ] CVE-2018-20019\n https://nvd.nist.gov/vuln/detail/CVE-2018-20019\n[ 2 ] CVE-2018-20020\n https://nvd.nist.gov/vuln/detail/CVE-2018-20020\n[ 3 ] CVE-2018-20021\n https://nvd.nist.gov/vuln/detail/CVE-2018-20021\n[ 4 ] CVE-2018-20022\n https://nvd.nist.gov/vuln/detail/CVE-2018-20022\n[ 5 ] CVE-2018-20023\n https://nvd.nist.gov/vuln/detail/CVE-2018-20023\n[ 6 ] CVE-2018-20024\n https://nvd.nist.gov/vuln/detail/CVE-2018-20024\n[ 7 ] CVE-2018-7225\n https://nvd.nist.gov/vuln/detail/CVE-2018-7225\n[ 8 ] CVE-2018-7226\n https://nvd.nist.gov/vuln/detail/CVE-2018-7226\n\nAvailability\n============\n\nThis GLSA and any updates to it are available for viewing at\nthe Gentoo Security Website:\n\n https://security.gentoo.org/glsa/201908-05\n\nConcerns?\n=========\n\nSecurity is a primary focus of Gentoo Linux and ensuring the\nconfidentiality and security of our users\u0027 machines is of utmost\nimportance to us. Any security concerns should be addressed to\nsecurity@gentoo.org or alternatively, you may file a bug at\nhttps://bugs.gentoo.org. \n\nLicense\n=======\n\nCopyright 2019 Gentoo Foundation, Inc; referenced text\nbelongs to its owner(s). \n\nThe contents of this document are licensed under the\nCreative Commons - Attribution / Share Alike license. \n\nhttps://creativecommons.org/licenses/by-sa/2.5\n. =========================================================================\nUbuntu Security Notice USN-4587-1\nOctober 20, 2020\n\nitalc vulnerabilities\n=========================================================================\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 16.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in iTALC. \n\nSoftware Description:\n- italc: didact tool which allows teachers to view and control computer labs\n\nDetails:\n\nNicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors\nand didn\u0027t check malloc return values. (CVE-2016-9941, CVE-2016-9942)\n\nIt was discovered that iTALC had an out-of-bounds write, multiple heap\nout-of-bounds writes, an infinite loop, improper initializations, and null\npointer vulnerabilities. (CVE-2018-15127,\nCVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023,\nCVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225,\nCVE-2019-15681)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 16.04 LTS:\n italc-client 1:2.0.2+dfsg1-4ubuntu0.1\n italc-master 1:2.0.2+dfsg1-4ubuntu0.1\n libitalccore 1:2.0.2+dfsg1-4ubuntu0.1\n\nIn general, a standard system update will make all the necessary changes. \n\nReferences:\n https://usn.ubuntu.com/4587-1\n CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054,\n CVE-2014-6055, CVE-2016-9941, CVE-2016-9942, CVE-2018-15127,\n CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022,\n CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749,\n CVE-2018-20750, CVE-2018-7225, CVE-2019-15681\n\nPackage Information:\n https://launchpad.net/ubuntu/+source/italc/1:2.0.2+dfsg1-4ubuntu0.1\n",
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VAR-202006-1843
Vulnerability from variot - Updated: 2024-11-23 20:33An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings. LibVNCServer Exists in a buffer error vulnerability.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4573-1 October 07, 2020
vino vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Vino.
Software Description: - vino: VNC server for GNOME
Details:
Nicolas Ruff discovered that Vino incorrectly handled large ClientCutText messages. A remote attacker could use this issue to cause the server to crash, resulting in a denial of service. (CVE-2014-6053)
It was discovered that Vino incorrectly handled certain packet lengths. A remote attacker could possibly use this issue to obtain sensitive information, cause a denial of service, or execute arbitrary code. (CVE-2018-7225)
Pavel Cheremushkin discovered that an information disclosure vulnerability existed in Vino when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive information. (CVE-2019-15681)
It was discovered that Vino incorrectly handled region clipping. A remote attacker could possibly use this issue to cause Vino to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that Vino incorrectly handled encodings. A remote attacker could use this issue to cause Vino to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: vino 3.22.0-5ubuntu2.1
Ubuntu 18.04 LTS: vino 3.22.0-3ubuntu1.1
Ubuntu 16.04 LTS: vino 3.8.1-0ubuntu9.3
After a standard system update you need to restart your session to make all the necessary changes.
References: https://usn.ubuntu.com/4573-1 CVE-2014-6053, CVE-2018-7225, CVE-2019-15681, CVE-2020-14397, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404
Package Information: https://launchpad.net/ubuntu/+source/vino/3.22.0-5ubuntu2.1 https://launchpad.net/ubuntu/+source/vino/3.22.0-3ubuntu1.1 https://launchpad.net/ubuntu/+source/vino/3.8.1-0ubuntu9.3
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VAR-202006-1845
Vulnerability from variot - Updated: 2024-11-23 20:31It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow. LibVNCServer Is vulnerable to lack of entropy.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. 8) - aarch64, ppc64le, x86_64
- ========================================================================== Ubuntu Security Notice USN-4407-1 July 01, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2019-15680)
It was discovered that an information disclosure vulnerability existed in LibVNCServer when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15681)
It was discovered that LibVNCServer incorrectly handled cursor shape updates. If a user were tricked in to connecting to a malicious server, an attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2017-18922)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.1 libvncserver1 0.9.12+dfsg-9ubuntu0.1
Ubuntu 19.10: libvncclient1 0.9.11+dfsg-1.3ubuntu0.1 libvncserver1 0.9.11+dfsg-1.3ubuntu0.1
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.2 libvncserver1 0.9.11+dfsg-1ubuntu1.2
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.4 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.4
After a standard system update you need to restart LibVNCServer to make all the necessary changes. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
====================================================================
Red Hat Security Advisory
Synopsis: Important: libvncserver security update Advisory ID: RHSA-2020:3281-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2020:3281 Issue date: 2020-08-03 CVE Names: CVE-2017-18922 ==================================================================== 1. Summary:
An update for libvncserver is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
- Relevant releases/architectures:
Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64le, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64le, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
- Description:
LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.
Security Fix(es):
- libvncserver: websocket decoding buffer overflow (CVE-2017-18922)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
- Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
- Bugs fixed (https://bugzilla.redhat.com/):
1852356 - CVE-2017-18922 libvncserver: websocket decoding buffer overflow
- Package List:
Red Hat Enterprise Linux Client (v. 7):
Source: libvncserver-0.9.9-14.el7_8.1.src.rpm
x86_64: libvncserver-0.9.9-14.el7_8.1.i686.rpm libvncserver-0.9.9-14.el7_8.1.x86_64.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: libvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm libvncserver-devel-0.9.9-14.el7_8.1.i686.rpm libvncserver-devel-0.9.9-14.el7_8.1.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: libvncserver-0.9.9-14.el7_8.1.src.rpm
ppc64le: libvncserver-0.9.9-14.el7_8.1.ppc64le.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.ppc64le.rpm
x86_64: libvncserver-0.9.9-14.el7_8.1.i686.rpm libvncserver-0.9.9-14.el7_8.1.x86_64.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
ppc64le: libvncserver-debuginfo-0.9.9-14.el7_8.1.ppc64le.rpm libvncserver-devel-0.9.9-14.el7_8.1.ppc64le.rpm
x86_64: libvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm libvncserver-devel-0.9.9-14.el7_8.1.i686.rpm libvncserver-devel-0.9.9-14.el7_8.1.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source: libvncserver-0.9.9-14.el7_8.1.src.rpm
x86_64: libvncserver-0.9.9-14.el7_8.1.i686.rpm libvncserver-0.9.9-14.el7_8.1.x86_64.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 7):
x86_64: libvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm libvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm libvncserver-devel-0.9.9-14.el7_8.1.i686.rpm libvncserver-devel-0.9.9-14.el7_8.1.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
- References:
https://access.redhat.com/security/cve/CVE-2017-18922 https://access.redhat.com/security/updates/classification/#important
- Contact:
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/
Copyright 2020 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . 8.1) - ppc64le, x86_64
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"data": "It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow. LibVNCServer Is vulnerable to lack of entropy.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. 8) - aarch64, ppc64le, x86_64\n\n3. ==========================================================================\nUbuntu Security Notice USN-4407-1\nJuly 01, 2020\n\nlibvncserver vulnerabilities\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 20.04 LTS\n- Ubuntu 19.10\n- Ubuntu 18.04 LTS\n- Ubuntu 16.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in LibVNCServer. An\nattacker could possibly use this issue to cause LibVNCServer to crash,\nresulting in a denial of service. (CVE-2019-15680)\n\nIt was discovered that an information disclosure vulnerability existed in\nLibVNCServer when sending a ServerCutText message. An attacker could\npossibly\nuse this issue to expose sensitive information. This issue only affected\nUbuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15681)\n\nIt was discovered that LibVNCServer incorrectly handled cursor shape\nupdates. \nIf a user were tricked in to connecting to a malicious server, an attacker\ncould possibly use this issue to cause LibVNCServer to crash, resulting in a\ndenial of service, or possibly execute arbitrary code. This issue only\naffected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. An attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service, or possibly execute arbitrary code. \nThis issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu\n16.04 LTS. \n(CVE-2017-18922)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 20.04 LTS:\nlibvncclient1 0.9.12+dfsg-9ubuntu0.1\nlibvncserver1 0.9.12+dfsg-9ubuntu0.1\n\nUbuntu 19.10:\nlibvncclient1 0.9.11+dfsg-1.3ubuntu0.1\nlibvncserver1 0.9.11+dfsg-1.3ubuntu0.1\n\nUbuntu 18.04 LTS:\nlibvncclient1 0.9.11+dfsg-1ubuntu1.2\nlibvncserver1 0.9.11+dfsg-1ubuntu1.2\n\nUbuntu 16.04 LTS:\nlibvncclient1 0.9.10+dfsg-3ubuntu0.16.04.4\nlibvncserver1 0.9.10+dfsg-3ubuntu0.16.04.4\n\nAfter a standard system update you need to restart LibVNCServer to make\nall the necessary changes. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n==================================================================== \nRed Hat Security Advisory\n\nSynopsis: Important: libvncserver security update\nAdvisory ID: RHSA-2020:3281-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2020:3281\nIssue date: 2020-08-03\nCVE Names: CVE-2017-18922\n====================================================================\n1. Summary:\n\nAn update for libvncserver is now available for Red Hat Enterprise Linux 7. \n\nRed Hat Product Security has rated this update as having a security impact\nof Important. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available for each vulnerability\nfrom the CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat Enterprise Linux Client (v. 7) - x86_64\nRed Hat Enterprise Linux Client Optional (v. 7) - x86_64\nRed Hat Enterprise Linux Server (v. 7) - ppc64le, x86_64\nRed Hat Enterprise Linux Server Optional (v. 7) - ppc64le, x86_64\nRed Hat Enterprise Linux Workstation (v. 7) - x86_64\nRed Hat Enterprise Linux Workstation Optional (v. 7) - x86_64\n\n3. Description:\n\nLibVNCServer is a C library that enables you to implement VNC server\nfunctionality into own programs. \n\nSecurity Fix(es):\n\n* libvncserver: websocket decoding buffer overflow (CVE-2017-18922)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1852356 - CVE-2017-18922 libvncserver: websocket decoding buffer overflow\n\n6. Package List:\n\nRed Hat Enterprise Linux Client (v. 7):\n\nSource:\nlibvncserver-0.9.9-14.el7_8.1.src.rpm\n\nx86_64:\nlibvncserver-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-0.9.9-14.el7_8.1.x86_64.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm\n\nRed Hat Enterprise Linux Client Optional (v. 7):\n\nx86_64:\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm\nlibvncserver-devel-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-devel-0.9.9-14.el7_8.1.x86_64.rpm\n\nRed Hat Enterprise Linux Server (v. 7):\n\nSource:\nlibvncserver-0.9.9-14.el7_8.1.src.rpm\n\nppc64le:\nlibvncserver-0.9.9-14.el7_8.1.ppc64le.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.ppc64le.rpm\n\nx86_64:\nlibvncserver-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-0.9.9-14.el7_8.1.x86_64.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional (v. 7):\n\nppc64le:\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.ppc64le.rpm\nlibvncserver-devel-0.9.9-14.el7_8.1.ppc64le.rpm\n\nx86_64:\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm\nlibvncserver-devel-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-devel-0.9.9-14.el7_8.1.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation (v. 7):\n\nSource:\nlibvncserver-0.9.9-14.el7_8.1.src.rpm\n\nx86_64:\nlibvncserver-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-0.9.9-14.el7_8.1.x86_64.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation Optional (v. 7):\n\nx86_64:\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-debuginfo-0.9.9-14.el7_8.1.x86_64.rpm\nlibvncserver-devel-0.9.9-14.el7_8.1.i686.rpm\nlibvncserver-devel-0.9.9-14.el7_8.1.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2017-18922\nhttps://access.redhat.com/security/updates/classification/#important\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. 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VAR-202006-1846
Vulnerability from variot - Updated: 2024-11-23 20:23An issue was discovered in LibVNCServer before 0.9.13. libvncserver/corre.c allows out-of-bounds access via encodings. LibVNCServer Exists in a buffer error vulnerability.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. (CVE-2018-7225)
Pavel Cheremushkin discovered that an information disclosure vulnerability existed in Vino when sending a ServerCutText message. ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.
References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5
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VAR-201901-1644
Vulnerability from variot - Updated: 2024-11-23 20:20LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete. LibVNC Contains an out-of-bounds vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. LibVNCServer is prone to a local heap-based buffer-overflow vulnerability. Attackers can exploit these issues to execute arbitrary code within the context of the user running the affected application. Failed attempts will likely cause a denial-of-service condition. Note: This issue is the result of an incomplete fix for issue CVE-2018-20019 described in 106821 (LibVNCServer CVE-2018-20019 Multiple Heap Buffer Overflow Vulnerabilities).
Software Description: - libvncserver: vnc server library
Details:
It was discovered that LibVNCServer incorrectly handled certain operations. ========================================================================= Ubuntu Security Notice USN-4587-1 October 20, 2020
italc vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in iTALC.
Software Description: - italc: didact tool which allows teachers to view and control computer labs
Details:
Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors and didn't check malloc return values. (CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055)
Josef Gajdusek discovered that iTALC had heap-based buffer overflow vulnerabilities. (CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 LTS: italc-client 1:2.0.2+dfsg1-4ubuntu0.1 italc-master 1:2.0.2+dfsg1-4ubuntu0.1 libitalccore 1:2.0.2+dfsg1-4ubuntu0.1
In general, a standard system update will make all the necessary changes.
References: https://usn.ubuntu.com/4587-1 CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055, CVE-2016-9941, CVE-2016-9942, CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681
Package Information: https://launchpad.net/ubuntu/+source/italc/1:2.0.2+dfsg1-4ubuntu0.1
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"data": "LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete. LibVNC Contains an out-of-bounds vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. LibVNCServer is prone to a local heap-based buffer-overflow vulnerability. \nAttackers can exploit these issues to execute arbitrary code within the context of the user running the affected application. Failed attempts will likely cause a denial-of-service condition. \nNote: This issue is the result of an incomplete fix for issue CVE-2018-20019 described in 106821 (LibVNCServer CVE-2018-20019 Multiple Heap Buffer Overflow Vulnerabilities). \n\nSoftware Description:\n- libvncserver: vnc server library\n\nDetails:\n\nIt was discovered that LibVNCServer incorrectly handled certain operations. =========================================================================\nUbuntu Security Notice USN-4587-1\nOctober 20, 2020\n\nitalc vulnerabilities\n=========================================================================\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 16.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in iTALC. \n\nSoftware Description:\n- italc: didact tool which allows teachers to view and control computer labs\n\nDetails:\n\nNicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors\nand didn\u0027t check malloc return values. \n(CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055)\n\nJosef Gajdusek discovered that iTALC had heap-based buffer overflow\nvulnerabilities. (CVE-2018-15127,\nCVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023,\nCVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225,\nCVE-2019-15681)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 16.04 LTS:\n italc-client 1:2.0.2+dfsg1-4ubuntu0.1\n italc-master 1:2.0.2+dfsg1-4ubuntu0.1\n libitalccore 1:2.0.2+dfsg1-4ubuntu0.1\n\nIn general, a standard system update will make all the necessary changes. \n\nReferences:\n https://usn.ubuntu.com/4587-1\n CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054,\n CVE-2014-6055, CVE-2016-9941, CVE-2016-9942, CVE-2018-15127,\n CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022,\n CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749,\n CVE-2018-20750, CVE-2018-7225, CVE-2019-15681\n\nPackage Information:\n https://launchpad.net/ubuntu/+source/italc/1:2.0.2+dfsg1-4ubuntu0.1\n",
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VAR-202004-2206
Vulnerability from variot - Updated: 2024-11-23 20:20libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690. LibVNCServer Exists in an integer overflow vulnerability.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4407-1 July 01, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
It was discovered that LibVNCServer incorrectly handled decompressing data. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2019-15680)
It was discovered that an information disclosure vulnerability existed in LibVNCServer when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15681)
It was discovered that LibVNCServer incorrectly handled cursor shape updates. If a user were tricked in to connecting to a malicious server, an attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15690, CVE-2019-20788)
It was discovered that LibVNCServer incorrectly handled decoding WebSocket frames. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2017-18922)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.1 libvncserver1 0.9.12+dfsg-9ubuntu0.1
Ubuntu 19.10: libvncclient1 0.9.11+dfsg-1.3ubuntu0.1 libvncserver1 0.9.11+dfsg-1.3ubuntu0.1
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.2 libvncserver1 0.9.11+dfsg-1ubuntu1.2
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.4 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.4
After a standard system update you need to restart LibVNCServer to make all the necessary changes.
References: https://usn.ubuntu.com/4407-1 CVE-2017-18922, CVE-2019-15680, CVE-2019-15681, CVE-2019-15690, CVE-2019-20788
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.1 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1.3ubuntu0.1 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.4
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VAR-202006-1842
Vulnerability from variot - Updated: 2024-11-23 20:16An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rre.c allows out-of-bounds access via encodings. LibVNCServer Exists in a buffer error vulnerability.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4573-1 October 07, 2020
vino vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Vino.
Software Description: - vino: VNC server for GNOME
Details:
Nicolas Ruff discovered that Vino incorrectly handled large ClientCutText messages. A remote attacker could use this issue to cause the server to crash, resulting in a denial of service. (CVE-2014-6053)
It was discovered that Vino incorrectly handled certain packet lengths. A remote attacker could possibly use this issue to obtain sensitive information, cause a denial of service, or execute arbitrary code. (CVE-2018-7225)
Pavel Cheremushkin discovered that an information disclosure vulnerability existed in Vino when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive information. (CVE-2019-15681)
It was discovered that Vino incorrectly handled region clipping. A remote attacker could possibly use this issue to cause Vino to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that Vino incorrectly handled encodings. A remote attacker could use this issue to cause Vino to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: vino 3.22.0-5ubuntu2.1
Ubuntu 18.04 LTS: vino 3.22.0-3ubuntu1.1
Ubuntu 16.04 LTS: vino 3.8.1-0ubuntu9.3
After a standard system update you need to restart your session to make all the necessary changes.
References: https://usn.ubuntu.com/4573-1 CVE-2014-6053, CVE-2018-7225, CVE-2019-15681, CVE-2020-14397, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404
Package Information: https://launchpad.net/ubuntu/+source/vino/3.22.0-5ubuntu2.1 https://launchpad.net/ubuntu/+source/vino/3.22.0-3ubuntu1.1 https://launchpad.net/ubuntu/+source/vino/3.8.1-0ubuntu9.3
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VAR-202006-1848
Vulnerability from variot - Updated: 2024-11-23 19:56An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer dereference. LibVNCServer To NULL A vulnerability exists regarding pointer dereference.Service operation interruption (DoS) It may be put into a state. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
====================================================================
Red Hat Security Advisory
Synopsis: Moderate: libvncserver security update Advisory ID: RHSA-2021:1811-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:1811 Issue date: 2021-05-18 CVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 CVE-2020-14405 CVE-2020-25708 ==================================================================== 1. Summary:
An update for libvncserver is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
- Relevant releases/architectures:
Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64
- Description:
LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.
Security Fix(es):
-
libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)
-
libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)
-
libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)
-
libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)
-
libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.
- Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
- Bugs fixed (https://bugzilla.redhat.com/):
1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock() 1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak 1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size 1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference 1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS
- Package List:
Red Hat Enterprise Linux AppStream (v. 8):
Source: libvncserver-0.9.11-17.el8.src.rpm
aarch64: libvncserver-0.9.11-17.el8.aarch64.rpm libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-0.9.11-17.el8.ppc64le.rpm libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-0.9.11-17.el8.s390x.rpm libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-0.9.11-17.el8.i686.rpm libvncserver-0.9.11-17.el8.x86_64.rpm libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm
Red Hat CodeReady Linux Builder (v. 8):
aarch64: libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm libvncserver-devel-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm libvncserver-devel-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm libvncserver-devel-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm libvncserver-devel-0.9.11-17.el8.i686.rpm libvncserver-devel-0.9.11-17.el8.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
- Contact:
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . (CVE-2018-7225)
Pavel Cheremushkin discovered that an information disclosure vulnerability existed in Vino when sending a ServerCutText message. ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.
References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5
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"data": "An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer dereference. LibVNCServer To NULL A vulnerability exists regarding pointer dereference.Service operation interruption (DoS) It may be put into a state. Pillow is a Python-based image processing library. \nThere is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n==================================================================== \nRed Hat Security Advisory\n\nSynopsis: Moderate: libvncserver security update\nAdvisory ID: RHSA-2021:1811-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2021:1811\nIssue date: 2021-05-18\nCVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397\n CVE-2020-14405 CVE-2020-25708\n====================================================================\n1. Summary:\n\nAn update for libvncserver is now available for Red Hat Enterprise Linux 8. \n\nRed Hat Product Security has rated this update as having a security impact\nof Moderate. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64\n\n3. Description:\n\nLibVNCServer is a C library that enables you to implement VNC server\nfunctionality into own programs. \n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information\nLeak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock()\n(CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n(CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n(CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could\nresult in DoS (CVE-2020-25708)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat\nEnterprise Linux 8.4 Release Notes linked from the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock()\n1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak\n1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS\n\n6. Package List:\n\nRed Hat Enterprise Linux AppStream (v. 8):\n\nSource:\nlibvncserver-0.9.11-17.el8.src.rpm\n\naarch64:\nlibvncserver-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-0.9.11-17.el8.s390x.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-0.9.11-17.el8.i686.rpm\nlibvncserver-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\n\nRed Hat CodeReady Linux Builder (v. 8):\n\naarch64:\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\nlibvncserver-devel-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-devel-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\nlibvncserver-devel-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\nlibvncserver-devel-0.9.11-17.el8.i686.rpm\nlibvncserver-devel-0.9.11-17.el8.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2021 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n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\n8A9MNz92TFY=uZts\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://listman.redhat.com/mailman/listinfo/rhsa-announce\n. \n(CVE-2018-7225)\n\nPavel Cheremushkin discovered that an information disclosure vulnerability\nexisted in Vino when sending a ServerCutText message. ==========================================================================\nUbuntu Security Notice USN-4434-1\nJuly 23, 2020\n\nlibvncserver vulnerabilities\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 20.04 LTS\n- Ubuntu 18.04 LTS\n- Ubuntu 16.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in LibVNCServer. \n\nSoftware Description:\n- libvncserver: vnc server library\n\nDetails:\n\nRamin Farajpour Cami discovered that LibVNCServer incorrectly handled\ncertain malformed unix socket names. A remote attacker could exploit this\nwith a crafted socket name, leading to a denial of service, or possibly\nexecute arbitrary code. (CVE-2019-20839)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)\n\nChristian Beier discovered that LibVNCServer incorrectly handled anonymous\nTLS connections. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 20.04 LTS. (CVE-2020-14396)\n\nIt was discovered that LibVNCServer incorrectly handled region clipping. A\nremote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14397)\n\nIt was discovered that LibVNCServer did not properly reset incorrectly\nterminated TCP connections. A remote attacker could possibly use this\nissue to cause an infinite loop, resulting in a denial of service. \n(CVE-2020-14398)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399,\nCVE-2020-14400)\n\nIt was discovered that LibVNCServer incorrectly handled screen scaling on\nthe server side. A remote attacker could use this issue to cause\nLibVNCServer to crash, resulting in a denial of service, or possibly\nexecute arbitrary code. (CVE-2020-14401)\n\nIt was discovered that LibVNCServer incorrectly handled encodings. A\nremote attacker could use this issue to cause LibVNCServer to crash,\nresulting in a denial of service, or possibly execute arbitrary code. \n(CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)\n\nIt was discovered that LibVNCServer incorrectly handled TextChat messages. \nA remote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14405)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 20.04 LTS:\n libvncclient1 0.9.12+dfsg-9ubuntu0.2\n libvncserver1 0.9.12+dfsg-9ubuntu0.2\n\nUbuntu 18.04 LTS:\n libvncclient1 0.9.11+dfsg-1ubuntu1.3\n libvncserver1 0.9.11+dfsg-1ubuntu1.3\n\nUbuntu 16.04 LTS:\n libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5\n libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5\n\nAfter a standard system update you need to restart LibVNCServer\napplications to make all the necessary changes. \n\nReferences:\n https://usn.ubuntu.com/4434-1\n CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397,\n CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401,\n CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405\n\nPackage Information:\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5\n",
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VAR-202006-1847
Vulnerability from variot - Updated: 2024-11-23 19:55An issue was discovered in LibVNCServer before 0.9.13. libvncserver/scale.c has a pixel_value integer overflow. LibVNCServer Exists in an integer overflow vulnerability.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.
References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5
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VAR-201901-1642
Vulnerability from variot - Updated: 2024-11-23 19:41LibVNC through 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete. LibVNC Contains an out-of-bounds vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. LibVNCServer is prone to multiple heap-based buffer overflow vulnerabilities. Attackers can exploit these issues to execute arbitrary code within the context of the application. Failed exploit attempts will likely cause a denial-of-service condition. Versions prior to LibVNCServer 0.9.12 are vulnerable. Note: This issue is the result of an incomplete fix for issue CVE-2018-15127 described in 106820 (LibVNCServer CVE-2018-15127 Heap Buffer Overflow Vulnerability). ========================================================================= Ubuntu Security Notice USN-4587-1 October 20, 2020
italc vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in iTALC.
Software Description: - italc: didact tool which allows teachers to view and control computer labs
Details:
Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors and didn't check malloc return values. (CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 LTS: italc-client 1:2.0.2+dfsg1-4ubuntu0.1 italc-master 1:2.0.2+dfsg1-4ubuntu0.1 libitalccore 1:2.0.2+dfsg1-4ubuntu0.1
In general, a standard system update will make all the necessary changes.
References: https://usn.ubuntu.com/4587-1 CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055, CVE-2016-9941, CVE-2016-9942, CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681
Package Information: https://launchpad.net/ubuntu/+source/italc/1:2.0.2+dfsg1-4ubuntu0.1
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VAR-202006-1851
Vulnerability from variot - Updated: 2024-11-23 19:29An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function. LibVNCServer There is an information leakage vulnerability in.Information may be obtained. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
====================================================================
Red Hat Security Advisory
Synopsis: Moderate: libvncserver security update Advisory ID: RHSA-2021:1811-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:1811 Issue date: 2021-05-18 CVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 CVE-2020-14405 CVE-2020-25708 ==================================================================== 1. Summary:
An update for libvncserver is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
- Relevant releases/architectures:
Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64
- Description:
LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.
Security Fix(es):
-
libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)
-
libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)
-
libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)
-
libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)
-
libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.
- Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
- Bugs fixed (https://bugzilla.redhat.com/):
1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock() 1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak 1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size 1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference 1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS
- Package List:
Red Hat Enterprise Linux AppStream (v. 8):
Source: libvncserver-0.9.11-17.el8.src.rpm
aarch64: libvncserver-0.9.11-17.el8.aarch64.rpm libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-0.9.11-17.el8.ppc64le.rpm libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-0.9.11-17.el8.s390x.rpm libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-0.9.11-17.el8.i686.rpm libvncserver-0.9.11-17.el8.x86_64.rpm libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm
Red Hat CodeReady Linux Builder (v. 8):
aarch64: libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm libvncserver-devel-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm libvncserver-devel-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm libvncserver-devel-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm libvncserver-devel-0.9.11-17.el8.i686.rpm libvncserver-devel-0.9.11-17.el8.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
- References:
https://access.redhat.com/security/cve/CVE-2018-21247 https://access.redhat.com/security/cve/CVE-2019-20839 https://access.redhat.com/security/cve/CVE-2020-14397 https://access.redhat.com/security/cve/CVE-2020-14405 https://access.redhat.com/security/cve/CVE-2020-25708 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/
- Contact:
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce
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"data": "An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function. LibVNCServer There is an information leakage vulnerability in.Information may be obtained. Pillow is a Python-based image processing library. \nThere is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n==================================================================== \nRed Hat Security Advisory\n\nSynopsis: Moderate: libvncserver security update\nAdvisory ID: RHSA-2021:1811-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2021:1811\nIssue date: 2021-05-18\nCVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397\n CVE-2020-14405 CVE-2020-25708\n====================================================================\n1. Summary:\n\nAn update for libvncserver is now available for Red Hat Enterprise Linux 8. \n\nRed Hat Product Security has rated this update as having a security impact\nof Moderate. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64\n\n3. Description:\n\nLibVNCServer is a C library that enables you to implement VNC server\nfunctionality into own programs. \n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information\nLeak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock()\n(CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n(CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n(CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could\nresult in DoS (CVE-2020-25708)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat\nEnterprise Linux 8.4 Release Notes linked from the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock()\n1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak\n1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS\n\n6. Package List:\n\nRed Hat Enterprise Linux AppStream (v. 8):\n\nSource:\nlibvncserver-0.9.11-17.el8.src.rpm\n\naarch64:\nlibvncserver-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-0.9.11-17.el8.s390x.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-0.9.11-17.el8.i686.rpm\nlibvncserver-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\n\nRed Hat CodeReady Linux Builder (v. 8):\n\naarch64:\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\nlibvncserver-devel-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-devel-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\nlibvncserver-devel-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\nlibvncserver-devel-0.9.11-17.el8.i686.rpm\nlibvncserver-devel-0.9.11-17.el8.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2018-21247\nhttps://access.redhat.com/security/cve/CVE-2019-20839\nhttps://access.redhat.com/security/cve/CVE-2020-14397\nhttps://access.redhat.com/security/cve/CVE-2020-14405\nhttps://access.redhat.com/security/cve/CVE-2020-25708\nhttps://access.redhat.com/security/updates/classification/#moderate\nhttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2021 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n\niQIVAwUBYKPzPNzjgjWX9erEAQgJcQ//eFCPv7OwkNtF1owJhqkboBZSSILHH2sX\nbXDy/9rdYjrY13E6kfMdjvXQyfSa8RM1lB+3LldAA1LokLqf6aTEHrBrjDadAKSW\n2FfxerEbatQLlQubcxtrb5gn3ZUv+8gf/n3E8Fgjxm4EQkCZC3TF7Smmj3ofELtq\n2aYKRKyOGrMR2JZuySPuB5fm9/8LcYlfn5atG4Yqc4QofgGe2YhORY6GuneUOSBr\nLi0LBXpBI7o3VY0dosXListDptm8UEZ8sx/hUEqR2YEBoQoGF3EZsuNsqzYkG99e\ni6LmBTh8zCgsnOHKrLVmG00YauAdpPrgmOq2cay7bw0jhAzp+huLtSCZ5yvEbh8p\nxOXM0YbocGwSoKdJ6RGaquYD4Vw/aKHIxp1L6BE3hMe2lIt6dObu+VxtgFmUVDFv\niUvmv9J1Jr7lZAByA0r+1gnnfrXyUc+ln3jhuu0xZ3tQvGiEAKAsvDNB8/78TCT/\nCmuU0jwvBxTqeISxAaWcCrl9LHg+gZv6wop8j8L/BDyEY4zQgAT11nRo0cXjFaE0\nYgmFxA5kAEqDiNr2k/kq3w+sUH9pdEhiJQTqTt0uZvHesKXaIKTa7YKnvPgWbolM\nNhw8esGKItirSh536uT/9/4DIQegxxM8sx5PhQCwL5pKldNGwiLyuFUF2ypRu9KT\n8A9MNz92TFY=uZts\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://listman.redhat.com/mailman/listinfo/rhsa-announce\n",
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VAR-202006-1849
Vulnerability from variot - Updated: 2024-11-23 19:27An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode. LibVNCServer Exists in a buffer error vulnerability.Service operation interruption (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.
References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5
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VAR-201901-1643
Vulnerability from variot - Updated: 2024-11-23 19:27LibVNC before 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete. LibVNC Contains an out-of-bounds vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. LibVNCServer is prone to multiple heap-based buffer overflow vulnerabilities. Attackers can exploit these issues to execute arbitrary code within the context of the application. Failed exploit attempts will likely cause a denial-of-service condition. Versions prior to LibVNCServer 0.9.12 are vulnerable. Note: This issue is the result of an incomplete fix for issue CVE-2018-15127 described in 106820 (LibVNCServer CVE-2018-15127 Heap Buffer Overflow Vulnerability). ========================================================================== Ubuntu Security Notice USN-4547-1 September 28, 2020
italc vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in iTALC.
Software Description: - italc: didact tool which allows teachers to view and control computer labs
Details:
It was discovered that an information disclosure vulnerability existed in the LibVNCServer vendored in iTALC when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive information. (CVE-2019-15681)
It was discovered that the LibVNCServer and LibVNCClient vendored in iTALC incorrectly handled certain packet lengths. (CVE-2018-15127 CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04 LTS: italc-client 1:3.0.3+dfsg1-3ubuntu0.1 italc-master 1:3.0.3+dfsg1-3ubuntu0.1 libitalccore 1:3.0.3+dfsg1-3ubuntu0.1
In general, a standard system update will make all the necessary changes.
References: https://usn.ubuntu.com/4547-1 CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681
Package Information: https://launchpad.net/ubuntu/+source/italc/1:3.0.3+dfsg1-3ubuntu0.1
-- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce
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"data": "LibVNC before 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete. LibVNC Contains an out-of-bounds vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. LibVNCServer is prone to multiple heap-based buffer overflow vulnerabilities. \nAttackers can exploit these issues to execute arbitrary code within the context of the application. Failed exploit attempts will likely cause a denial-of-service condition. \nVersions prior to LibVNCServer 0.9.12 are vulnerable. \nNote: This issue is the result of an incomplete fix for issue CVE-2018-15127 described in 106820 (LibVNCServer CVE-2018-15127 Heap Buffer Overflow Vulnerability). ==========================================================================\nUbuntu Security Notice USN-4547-1\nSeptember 28, 2020\n\nitalc vulnerabilities\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 18.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in iTALC. \n\nSoftware Description:\n- italc: didact tool which allows teachers to view and control computer labs\n\nDetails:\n\nIt was discovered that an information disclosure vulnerability existed in the\nLibVNCServer vendored in iTALC when sending a ServerCutText message. An\nattacker could possibly use this issue to expose sensitive information. \n(CVE-2019-15681)\n\nIt was discovered that the LibVNCServer and LibVNCClient vendored in iTALC\nincorrectly handled certain packet lengths. \n(CVE-2018-15127 CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022,\nCVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750,\nCVE-2018-7225, CVE-2019-15681)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 18.04 LTS:\n italc-client 1:3.0.3+dfsg1-3ubuntu0.1\n italc-master 1:3.0.3+dfsg1-3ubuntu0.1\n libitalccore 1:3.0.3+dfsg1-3ubuntu0.1\n\nIn general, a standard system update will make all the necessary changes. \n\nReferences:\n https://usn.ubuntu.com/4547-1\n CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021,\n CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748,\n CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681\n\nPackage Information:\n https://launchpad.net/ubuntu/+source/italc/1:3.0.3+dfsg1-3ubuntu0.1\n\n-- \nubuntu-security-announce mailing list\nubuntu-security-announce@lists.ubuntu.com\nModify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce\n",
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VAR-202006-1841
Vulnerability from variot - Updated: 2024-11-23 19:26An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size. LibVNCServer Is vulnerable to resource allocation without restrictions or throttling.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
====================================================================
Red Hat Security Advisory
Synopsis: Moderate: libvncserver security update Advisory ID: RHSA-2021:1811-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:1811 Issue date: 2021-05-18 CVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397 CVE-2020-14405 CVE-2020-25708 ==================================================================== 1. Summary:
An update for libvncserver is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
- Relevant releases/architectures:
Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64
- Description:
LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.
Security Fix(es):
-
libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)
-
libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)
-
libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)
-
libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)
-
libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.
- Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
- Bugs fixed (https://bugzilla.redhat.com/):
1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock() 1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak 1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size 1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference 1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS
- Package List:
Red Hat Enterprise Linux AppStream (v. 8):
Source: libvncserver-0.9.11-17.el8.src.rpm
aarch64: libvncserver-0.9.11-17.el8.aarch64.rpm libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-0.9.11-17.el8.ppc64le.rpm libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-0.9.11-17.el8.s390x.rpm libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-0.9.11-17.el8.i686.rpm libvncserver-0.9.11-17.el8.x86_64.rpm libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm
Red Hat CodeReady Linux Builder (v. 8):
aarch64: libvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm libvncserver-debugsource-0.9.11-17.el8.aarch64.rpm libvncserver-devel-0.9.11-17.el8.aarch64.rpm
ppc64le: libvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm libvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm libvncserver-devel-0.9.11-17.el8.ppc64le.rpm
s390x: libvncserver-debuginfo-0.9.11-17.el8.s390x.rpm libvncserver-debugsource-0.9.11-17.el8.s390x.rpm libvncserver-devel-0.9.11-17.el8.s390x.rpm
x86_64: libvncserver-debuginfo-0.9.11-17.el8.i686.rpm libvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm libvncserver-debugsource-0.9.11-17.el8.i686.rpm libvncserver-debugsource-0.9.11-17.el8.x86_64.rpm libvncserver-devel-0.9.11-17.el8.i686.rpm libvncserver-devel-0.9.11-17.el8.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
- Contact:
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1
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-- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020
libvncserver vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in LibVNCServer.
Software Description: - libvncserver: vnc server library
Details:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)
Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)
It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)
It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)
It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)
It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)
It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)
It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2
Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3
Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
After a standard system update you need to restart LibVNCServer applications to make all the necessary changes.
References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405
Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5
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"data": "An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size. LibVNCServer Is vulnerable to resource allocation without restrictions or throttling.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. Pillow is a Python-based image processing library. \nThere is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n==================================================================== \nRed Hat Security Advisory\n\nSynopsis: Moderate: libvncserver security update\nAdvisory ID: RHSA-2021:1811-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2021:1811\nIssue date: 2021-05-18\nCVE Names: CVE-2018-21247 CVE-2019-20839 CVE-2020-14397\n CVE-2020-14405 CVE-2020-25708\n====================================================================\n1. Summary:\n\nAn update for libvncserver is now available for Red Hat Enterprise Linux 8. \n\nRed Hat Product Security has rated this update as having a security impact\nof Moderate. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64\n\n3. Description:\n\nLibVNCServer is a C library that enables you to implement VNC server\nfunctionality into own programs. \n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information\nLeak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock()\n(CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n(CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n(CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could\nresult in DoS (CVE-2020-25708)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat\nEnterprise Linux 8.4 Release Notes linked from the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1849877 - CVE-2019-20839 libvncserver: buffer overflow in ConnectClientToUnixSock()\n1849886 - CVE-2018-21247 libvncserver: uninitialized memory contents are vulnerable to Information Leak\n1860325 - CVE-2020-14405 libvncserver: libvncclient/rfbproto.c does not limit TextChat size\n1860344 - CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference\n1896739 - CVE-2020-25708 libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS\n\n6. Package List:\n\nRed Hat Enterprise Linux AppStream (v. 8):\n\nSource:\nlibvncserver-0.9.11-17.el8.src.rpm\n\naarch64:\nlibvncserver-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-0.9.11-17.el8.s390x.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-0.9.11-17.el8.i686.rpm\nlibvncserver-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\n\nRed Hat CodeReady Linux Builder (v. 8):\n\naarch64:\nlibvncserver-debuginfo-0.9.11-17.el8.aarch64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.aarch64.rpm\nlibvncserver-devel-0.9.11-17.el8.aarch64.rpm\n\nppc64le:\nlibvncserver-debuginfo-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-debugsource-0.9.11-17.el8.ppc64le.rpm\nlibvncserver-devel-0.9.11-17.el8.ppc64le.rpm\n\ns390x:\nlibvncserver-debuginfo-0.9.11-17.el8.s390x.rpm\nlibvncserver-debugsource-0.9.11-17.el8.s390x.rpm\nlibvncserver-devel-0.9.11-17.el8.s390x.rpm\n\nx86_64:\nlibvncserver-debuginfo-0.9.11-17.el8.i686.rpm\nlibvncserver-debuginfo-0.9.11-17.el8.x86_64.rpm\nlibvncserver-debugsource-0.9.11-17.el8.i686.rpm\nlibvncserver-debugsource-0.9.11-17.el8.x86_64.rpm\nlibvncserver-devel-0.9.11-17.el8.i686.rpm\nlibvncserver-devel-0.9.11-17.el8.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security. Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2021 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n\niQIVAwUBYKPzPNzjgjWX9erEAQgJcQ//eFCPv7OwkNtF1owJhqkboBZSSILHH2sX\nbXDy/9rdYjrY13E6kfMdjvXQyfSa8RM1lB+3LldAA1LokLqf6aTEHrBrjDadAKSW\n2FfxerEbatQLlQubcxtrb5gn3ZUv+8gf/n3E8Fgjxm4EQkCZC3TF7Smmj3ofELtq\n2aYKRKyOGrMR2JZuySPuB5fm9/8LcYlfn5atG4Yqc4QofgGe2YhORY6GuneUOSBr\nLi0LBXpBI7o3VY0dosXListDptm8UEZ8sx/hUEqR2YEBoQoGF3EZsuNsqzYkG99e\ni6LmBTh8zCgsnOHKrLVmG00YauAdpPrgmOq2cay7bw0jhAzp+huLtSCZ5yvEbh8p\nxOXM0YbocGwSoKdJ6RGaquYD4Vw/aKHIxp1L6BE3hMe2lIt6dObu+VxtgFmUVDFv\niUvmv9J1Jr7lZAByA0r+1gnnfrXyUc+ln3jhuu0xZ3tQvGiEAKAsvDNB8/78TCT/\nCmuU0jwvBxTqeISxAaWcCrl9LHg+gZv6wop8j8L/BDyEY4zQgAT11nRo0cXjFaE0\nYgmFxA5kAEqDiNr2k/kq3w+sUH9pdEhiJQTqTt0uZvHesKXaIKTa7YKnvPgWbolM\nNhw8esGKItirSh536uT/9/4DIQegxxM8sx5PhQCwL5pKldNGwiLyuFUF2ypRu9KT\n8A9MNz92TFY=uZts\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://listman.redhat.com/mailman/listinfo/rhsa-announce\n. ==========================================================================\nUbuntu Security Notice USN-4434-1\nJuly 23, 2020\n\nlibvncserver vulnerabilities\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 20.04 LTS\n- Ubuntu 18.04 LTS\n- Ubuntu 16.04 LTS\n\nSummary:\n\nSeveral security issues were fixed in LibVNCServer. \n\nSoftware Description:\n- libvncserver: vnc server library\n\nDetails:\n\nRamin Farajpour Cami discovered that LibVNCServer incorrectly handled\ncertain malformed unix socket names. A remote attacker could exploit this\nwith a crafted socket name, leading to a denial of service, or possibly\nexecute arbitrary code. (CVE-2019-20839)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)\n\nChristian Beier discovered that LibVNCServer incorrectly handled anonymous\nTLS connections. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. This issue only\naffected Ubuntu 20.04 LTS. (CVE-2020-14396)\n\nIt was discovered that LibVNCServer incorrectly handled region clipping. A\nremote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14397)\n\nIt was discovered that LibVNCServer did not properly reset incorrectly\nterminated TCP connections. A remote attacker could possibly use this\nissue to cause an infinite loop, resulting in a denial of service. \n(CVE-2020-14398)\n\nIt was discovered that LibVNCServer did not properly access byte-aligned\ndata. A remote attacker could possibly use this issue to cause\nLibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399,\nCVE-2020-14400)\n\nIt was discovered that LibVNCServer incorrectly handled screen scaling on\nthe server side. A remote attacker could use this issue to cause\nLibVNCServer to crash, resulting in a denial of service, or possibly\nexecute arbitrary code. (CVE-2020-14401)\n\nIt was discovered that LibVNCServer incorrectly handled encodings. A\nremote attacker could use this issue to cause LibVNCServer to crash,\nresulting in a denial of service, or possibly execute arbitrary code. \n(CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)\n\nIt was discovered that LibVNCServer incorrectly handled TextChat messages. \nA remote attacker could possibly use this issue to cause LibVNCServer to\ncrash, resulting in a denial of service. (CVE-2020-14405)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 20.04 LTS:\n libvncclient1 0.9.12+dfsg-9ubuntu0.2\n libvncserver1 0.9.12+dfsg-9ubuntu0.2\n\nUbuntu 18.04 LTS:\n libvncclient1 0.9.11+dfsg-1ubuntu1.3\n libvncserver1 0.9.11+dfsg-1ubuntu1.3\n\nUbuntu 16.04 LTS:\n libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5\n libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5\n\nAfter a standard system update you need to restart LibVNCServer\napplications to make all the necessary changes. \n\nReferences:\n https://usn.ubuntu.com/4434-1\n CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397,\n CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401,\n CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405\n\nPackage Information:\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3\n https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5\n",
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