VAR-201903-0388

Vulnerability from variot - Updated: 2025-12-22 21:51

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. libssh2 Contains an integer overflow vulnerability.Information is obtained and service operation is interrupted (DoS) There is a possibility of being put into a state. It can execute remote commands and file transfers, and at the same time provide a secure transmission channel for remote programs. An integer overflow vulnerability exists in libssh2. The vulnerability is caused by the '_libssh2_transport_read()' function not properly checking the packet_length value from the server. 6) - i386, x86_64

  1. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

====================================================================
Red Hat Security Advisory

Synopsis: Important: libssh2 security update Advisory ID: RHSA-2019:0679-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:0679 Issue date: 2019-03-28 CVE Names: CVE-2019-3855 CVE-2019-3856 CVE-2019-3857 CVE-2019-3863 ==================================================================== 1. Summary:

An update for libssh2 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.

  1. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le, s390x

  1. Description:

The libssh2 packages provide a library that implements the SSH2 protocol.

  1. 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

After installing these updated packages, all running applications using libssh2 must be restarted for this update to take effect.

  1. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source: libssh2-1.4.3-12.el7_6.2.src.rpm

x86_64: libssh2-1.4.3-12.el7_6.2.i686.rpm libssh2-1.4.3-12.el7_6.2.x86_64.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

noarch: libssh2-docs-1.4.3-12.el7_6.2.noarch.rpm

x86_64: libssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm libssh2-devel-1.4.3-12.el7_6.2.i686.rpm libssh2-devel-1.4.3-12.el7_6.2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source: libssh2-1.4.3-12.el7_6.2.src.rpm

x86_64: libssh2-1.4.3-12.el7_6.2.i686.rpm libssh2-1.4.3-12.el7_6.2.x86_64.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

noarch: libssh2-docs-1.4.3-12.el7_6.2.noarch.rpm

x86_64: libssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm libssh2-devel-1.4.3-12.el7_6.2.i686.rpm libssh2-devel-1.4.3-12.el7_6.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source: libssh2-1.4.3-12.el7_6.2.src.rpm

ppc64: libssh2-1.4.3-12.el7_6.2.ppc.rpm libssh2-1.4.3-12.el7_6.2.ppc64.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.ppc.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.ppc64.rpm

ppc64le: libssh2-1.4.3-12.el7_6.2.ppc64le.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.ppc64le.rpm

s390x: libssh2-1.4.3-12.el7_6.2.s390.rpm libssh2-1.4.3-12.el7_6.2.s390x.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.s390.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.s390x.rpm

x86_64: libssh2-1.4.3-12.el7_6.2.i686.rpm libssh2-1.4.3-12.el7_6.2.x86_64.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source: libssh2-1.4.3-12.el7_6.2.src.rpm

aarch64: libssh2-1.4.3-12.el7_6.2.aarch64.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.aarch64.rpm

ppc64le: libssh2-1.4.3-12.el7_6.2.ppc64le.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.ppc64le.rpm

s390x: libssh2-1.4.3-12.el7_6.2.s390.rpm libssh2-1.4.3-12.el7_6.2.s390x.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.s390.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

noarch: libssh2-docs-1.4.3-12.el7_6.2.noarch.rpm

ppc64: libssh2-debuginfo-1.4.3-12.el7_6.2.ppc.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.ppc64.rpm libssh2-devel-1.4.3-12.el7_6.2.ppc.rpm libssh2-devel-1.4.3-12.el7_6.2.ppc64.rpm

ppc64le: libssh2-debuginfo-1.4.3-12.el7_6.2.ppc64le.rpm libssh2-devel-1.4.3-12.el7_6.2.ppc64le.rpm

s390x: libssh2-debuginfo-1.4.3-12.el7_6.2.s390.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.s390x.rpm libssh2-devel-1.4.3-12.el7_6.2.s390.rpm libssh2-devel-1.4.3-12.el7_6.2.s390x.rpm

x86_64: libssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm libssh2-devel-1.4.3-12.el7_6.2.i686.rpm libssh2-devel-1.4.3-12.el7_6.2.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64: libssh2-debuginfo-1.4.3-12.el7_6.2.aarch64.rpm libssh2-devel-1.4.3-12.el7_6.2.aarch64.rpm

noarch: libssh2-docs-1.4.3-12.el7_6.2.noarch.rpm

ppc64le: libssh2-debuginfo-1.4.3-12.el7_6.2.ppc64le.rpm libssh2-devel-1.4.3-12.el7_6.2.ppc64le.rpm

s390x: libssh2-debuginfo-1.4.3-12.el7_6.2.s390.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.s390x.rpm libssh2-devel-1.4.3-12.el7_6.2.s390.rpm libssh2-devel-1.4.3-12.el7_6.2.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source: libssh2-1.4.3-12.el7_6.2.src.rpm

x86_64: libssh2-1.4.3-12.el7_6.2.i686.rpm libssh2-1.4.3-12.el7_6.2.x86_64.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

noarch: libssh2-docs-1.4.3-12.el7_6.2.noarch.rpm

x86_64: libssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm libssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm libssh2-devel-1.4.3-12.el7_6.2.i686.rpm libssh2-devel-1.4.3-12.el7_6.2.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/

  1. References:

https://access.redhat.com/security/cve/CVE-2019-3855 https://access.redhat.com/security/cve/CVE-2019-3856 https://access.redhat.com/security/cve/CVE-2019-3857 https://access.redhat.com/security/cve/CVE-2019-3863 https://access.redhat.com/security/updates/classification/#important

  1. Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

Copyright 2019 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 . 7.3) - x86_64

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    "data": "An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. libssh2 Contains an integer overflow vulnerability.Information is obtained and service operation is interrupted (DoS) There is a possibility of being put into a state. It can execute remote commands and file transfers, and at the same time provide a secure transmission channel for remote programs. An integer overflow vulnerability exists in libssh2. The vulnerability is caused by the \u0027_libssh2_transport_read()\u0027 function not properly checking the packet_length value from the server. 6) - i386, x86_64\n\n3. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n====================================================================                   \nRed Hat Security Advisory\n\nSynopsis:          Important: libssh2 security update\nAdvisory ID:       RHSA-2019:0679-01\nProduct:           Red Hat Enterprise Linux\nAdvisory URL:      https://access.redhat.com/errata/RHSA-2019:0679\nIssue date:        2019-03-28\nCVE Names:         CVE-2019-3855 CVE-2019-3856 CVE-2019-3857\n                   CVE-2019-3863\n====================================================================\n1. Summary:\n\nAn update for libssh2 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) - noarch, x86_64\nRed Hat Enterprise Linux ComputeNode (v. 7) - x86_64\nRed Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64\nRed Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64\nRed Hat Enterprise Linux Workstation (v. 7) - x86_64\nRed Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64\nRed Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x\nRed Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le, s390x\n\n3. Description:\n\nThe libssh2 packages provide a library that implements the SSH2 protocol. \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\nAfter installing these updated packages, all running applications using\nlibssh2 must be restarted for this update to take effect. \n\n5. Package List:\n\nRed Hat Enterprise Linux Client (v. 7):\n\nSource:\nlibssh2-1.4.3-12.el7_6.2.src.rpm\n\nx86_64:\nlibssh2-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-1.4.3-12.el7_6.2.x86_64.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm\n\nRed Hat Enterprise Linux Client Optional (v. 7):\n\nnoarch:\nlibssh2-docs-1.4.3-12.el7_6.2.noarch.rpm\n\nx86_64:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.x86_64.rpm\n\nRed Hat Enterprise Linux ComputeNode (v. 7):\n\nSource:\nlibssh2-1.4.3-12.el7_6.2.src.rpm\n\nx86_64:\nlibssh2-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-1.4.3-12.el7_6.2.x86_64.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm\n\nRed Hat Enterprise Linux ComputeNode Optional (v. 7):\n\nnoarch:\nlibssh2-docs-1.4.3-12.el7_6.2.noarch.rpm\n\nx86_64:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.x86_64.rpm\n\nRed Hat Enterprise Linux Server (v. 7):\n\nSource:\nlibssh2-1.4.3-12.el7_6.2.src.rpm\n\nppc64:\nlibssh2-1.4.3-12.el7_6.2.ppc.rpm\nlibssh2-1.4.3-12.el7_6.2.ppc64.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.ppc.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.ppc64.rpm\n\nppc64le:\nlibssh2-1.4.3-12.el7_6.2.ppc64le.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.ppc64le.rpm\n\ns390x:\nlibssh2-1.4.3-12.el7_6.2.s390.rpm\nlibssh2-1.4.3-12.el7_6.2.s390x.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.s390.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.s390x.rpm\n\nx86_64:\nlibssh2-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-1.4.3-12.el7_6.2.x86_64.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm\n\nRed Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):\n\nSource:\nlibssh2-1.4.3-12.el7_6.2.src.rpm\n\naarch64:\nlibssh2-1.4.3-12.el7_6.2.aarch64.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.aarch64.rpm\n\nppc64le:\nlibssh2-1.4.3-12.el7_6.2.ppc64le.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.ppc64le.rpm\n\ns390x:\nlibssh2-1.4.3-12.el7_6.2.s390.rpm\nlibssh2-1.4.3-12.el7_6.2.s390x.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.s390.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.s390x.rpm\n\nRed Hat Enterprise Linux Server Optional (v. 7):\n\nnoarch:\nlibssh2-docs-1.4.3-12.el7_6.2.noarch.rpm\n\nppc64:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.ppc.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.ppc64.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.ppc.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.ppc64.rpm\n\nppc64le:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.ppc64le.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.ppc64le.rpm\n\ns390x:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.s390.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.s390x.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.s390.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.s390x.rpm\n\nx86_64:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.x86_64.rpm\n\nRed Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):\n\naarch64:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.aarch64.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.aarch64.rpm\n\nnoarch:\nlibssh2-docs-1.4.3-12.el7_6.2.noarch.rpm\n\nppc64le:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.ppc64le.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.ppc64le.rpm\n\ns390x:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.s390.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.s390x.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.s390.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.s390x.rpm\n\nRed Hat Enterprise Linux Workstation (v. 7):\n\nSource:\nlibssh2-1.4.3-12.el7_6.2.src.rpm\n\nx86_64:\nlibssh2-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-1.4.3-12.el7_6.2.x86_64.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation Optional (v. 7):\n\nnoarch:\nlibssh2-docs-1.4.3-12.el7_6.2.noarch.rpm\n\nx86_64:\nlibssh2-debuginfo-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-debuginfo-1.4.3-12.el7_6.2.x86_64.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.i686.rpm\nlibssh2-devel-1.4.3-12.el7_6.2.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-2019-3855\nhttps://access.redhat.com/security/cve/CVE-2019-3856\nhttps://access.redhat.com/security/cve/CVE-2019-3857\nhttps://access.redhat.com/security/cve/CVE-2019-3863\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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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.