VAR-201805-0950
Vulnerability from variot - Updated: 2026-04-10 22:40A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs. In some circumstances, some operating systems or hypervisors may not expect or properly handle an Intel architecture hardware debug exception. Microsoft Windows is prone to a local privilege-escalation vulnerability. An attacker can exploit this issue to execute arbitrary code with elevated privileges. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
===================================================================== Red Hat Security Advisory
Synopsis: Important: kernel security update Advisory ID: RHSA-2018:1347-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:1347 Issue date: 2018-05-08 CVE Names: CVE-2018-1087 CVE-2018-8897 CVE-2018-1000199 =====================================================================
- Summary:
An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions.
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 Server AUS (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server E4S (v. 7.2) - noarch, ppc64le, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional E4S (v. 7.2) - ppc64le, x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server TUS (v. 7.2) - noarch, x86_64
- Description:
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
-
Kernel: KVM: error in exception handling leads to wrong debug stack value (CVE-2018-1087)
-
Kernel: error in exception handling leads to DoS (CVE-2018-8897)
-
kernel: ptrace() incorrect error handling leads to corruption and DoS (CVE-2018-1000199)
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
Red Hat would like to thank Andy Lutomirski for reporting CVE-2018-1087 and CVE-2018-1000199 and Nick Peterson (Everdox Tech LLC) and Andy Lutomirski for reporting CVE-2018-8897.
- 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
The system must be rebooted for this update to take effect.
- Bugs fixed (https://bugzilla.redhat.com/):
1566837 - CVE-2018-1087 Kernel: KVM: error in exception handling leads to wrong debug stack value 1567074 - CVE-2018-8897 Kernel: error in exception handling leads to DoS 1568477 - CVE-2018-1000199 kernel: ptrace() incorrect error handling leads to corruption and DoS
- Package List:
Red Hat Enterprise Linux Server AUS (v. 7.2):
Source: kernel-3.10.0-327.66.3.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.66.3.el7.noarch.rpm kernel-doc-3.10.0-327.66.3.el7.noarch.rpm
x86_64: kernel-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm kernel-devel-3.10.0-327.66.3.el7.x86_64.rpm kernel-headers-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.66.3.el7.x86_64.rpm perf-3.10.0-327.66.3.el7.x86_64.rpm perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm python-perf-3.10.0-327.66.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server E4S (v. 7.2):
Source: kernel-3.10.0-327.66.3.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.66.3.el7.noarch.rpm kernel-doc-3.10.0-327.66.3.el7.noarch.rpm
ppc64le: kernel-3.10.0-327.66.3.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-327.66.3.el7.ppc64le.rpm kernel-debug-3.10.0-327.66.3.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm kernel-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-327.66.3.el7.ppc64le.rpm kernel-devel-3.10.0-327.66.3.el7.ppc64le.rpm kernel-headers-3.10.0-327.66.3.el7.ppc64le.rpm kernel-tools-3.10.0-327.66.3.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm kernel-tools-libs-3.10.0-327.66.3.el7.ppc64le.rpm perf-3.10.0-327.66.3.el7.ppc64le.rpm perf-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm python-perf-3.10.0-327.66.3.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm
x86_64: kernel-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm kernel-devel-3.10.0-327.66.3.el7.x86_64.rpm kernel-headers-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.66.3.el7.x86_64.rpm perf-3.10.0-327.66.3.el7.x86_64.rpm perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm python-perf-3.10.0-327.66.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server TUS (v. 7.2):
Source: kernel-3.10.0-327.66.3.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.66.3.el7.noarch.rpm kernel-doc-3.10.0-327.66.3.el7.noarch.rpm
x86_64: kernel-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm kernel-devel-3.10.0-327.66.3.el7.x86_64.rpm kernel-headers-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.66.3.el7.x86_64.rpm perf-3.10.0-327.66.3.el7.x86_64.rpm perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm python-perf-3.10.0-327.66.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 7.2):
x86_64: kernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.66.3.el7.x86_64.rpm perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional E4S (v. 7.2):
ppc64le: kernel-debug-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm kernel-debug-devel-3.10.0-327.66.3.el7.ppc64le.rpm kernel-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-327.66.3.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-327.66.3.el7.ppc64le.rpm perf-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm
x86_64: kernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.66.3.el7.x86_64.rpm perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional TUS (v. 7.2):
x86_64: kernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.66.3.el7.x86_64.rpm perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.66.3.el7.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-2018-1087 https://access.redhat.com/security/cve/CVE-2018-8897 https://access.redhat.com/security/cve/CVE-2018-1000199 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 2018 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 . These CVEs are both related to the way that the linux kernel handles certain interrupt and exception instructions. The issue can be triggered by an unprivileged user.
The fix for this problem requires modification of the interrupt descriptor tables (IDT), and modification of the interrupt handlers. Livepatch is unable to safely modify these areas, so upgrading to a corrected kernel and rebooting is required to fix the problem.
References: CVE-2018-1087, CVE-2018-8897
-- 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 . Description:
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Bug Fix(es):
-
The kernel-rt packages have been upgraded to the 3.10.0-862.2.3 source tree, which provides a number of bug fixes over the previous version. (BZ#1549768)
-
Intel Architecture (processor architecture) is a CPU specification developed by Intel Corporation for its processor. There are security vulnerabilities in the operating systems of multiple vendors. Systems from the following vendors are affected: Apple; DragonFly BSD Project; FreeBSD Project; Linux Kernel; Microsoft; Red Hat; SUSE Linux; Ubuntu; Vmware; Xen.
CVE-2018-10471
An error was discovered in the mitigations against Meltdown which
could result in denial of service.
CVE-2018-10472
Anthony Perard discovered that incorrect parsing of CDROM images
can result in information disclosure.
CVE-2018-10981
Jan Beulich discovered that malformed device models could result
in denial of service.
CVE-2018-10982
Roger Pau Monne discovered that incorrect handling of high precision
event timers could result in denial of service and potentially
privilege escalation.
For the stable distribution (stretch), these problems have been fixed in version 4.8.3+comet2+shim4.10.0+comet3-1+deb9u6.
We recommend that you upgrade your xen packages.
For the detailed security status of xen please refer to its security tracker page at: https://security-tracker.debian.org/tracker/xen
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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APPLE-SA-2018-05-08-1 Additional information for APPLE-SA-2018-04-24-2 Security Update 2018-001
Security Update 2018-001 addresses the following:
Crash Reporter Available for: macOS High Sierra 10.13.4 Impact: An application may be able to gain elevated privileges Description: A memory corruption issue was addressed with improved error handling. The issue appears to be from an undocumented side effect of the instructions. CVE-2018-8897: Andy Lutomirski, Nick Peterson (linkedin.com/in/everdox) of Everdox Tech LLC Entry added May 8, 2018
LinkPresentation Available for: macOS High Sierra 10.13.4 Impact: Processing a maliciously crafted text message may lead to UI spoofing Description: A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation. ========================================================================== Ubuntu Security Notice USN-3641-2 May 08, 2018
linux, linux-lts-trusty vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 ESM
Summary:
Several security issues were fixed in the Linux kernel. This update provides the corresponding updates for Ubuntu 12.04 ESM. A local attacker could use this to cause a denial of service (system crash). This issue only affected the amd64 architecture. A local attacker in a KVM virtual machine could use this to cause a denial of service (guest VM crash) or possibly escalate privileges inside of the virtual machine. This issue only affected the i386 and amd64 architectures. (CVE-2018-1087)
Andy Lutomirski discovered that the Linux kernel did not properly perform error handling on virtualized debug registers. (CVE-2018-1000199)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 12.04 ESM: linux-image-3.13.0-147-generic 3.13.0-147.196~precise1 linux-image-3.13.0-147-generic-lpae 3.13.0-147.196~precise1 linux-image-3.2.0-134-generic 3.2.0-134.180 linux-image-3.2.0-134-generic-pae 3.2.0-134.180 linux-image-3.2.0-134-highbank 3.2.0-134.180 linux-image-3.2.0-134-omap 3.2.0-134.180 linux-image-3.2.0-134-powerpc-smp 3.2.0-134.180 linux-image-3.2.0-134-powerpc64-smp 3.2.0-134.180 linux-image-3.2.0-134-virtual 3.2.0-134.180 linux-image-generic 3.2.0.134.149 linux-image-generic-lpae-lts-trusty 3.13.0.147.138 linux-image-generic-lts-trusty 3.13.0.147.138 linux-image-generic-pae 3.2.0.134.149 linux-image-highbank 3.2.0.134.149 linux-image-omap 3.2.0.134.149 linux-image-powerpc 3.2.0.134.149 linux-image-powerpc-smp 3.2.0.134.149 linux-image-powerpc64-smp 3.2.0.134.149
After a standard system update you need to reboot your computer to make all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. Summary:
Updated redhat-virtualization-host packages that fix several bugs and add various enhancements are now available. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks.
Includes GlusterFS fixes for CVE-2018-1088, dhcp fixes for CVE-2018-1111, kernel fixes for CVE-2018-1087, and kernel fixes for CVE-2018-8897.
A list of bugs fixed in this update is available in the Technical Notes book: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/ht ml/technical_notes/
- Solution:
Before applying this update, make sure all previously released errata relevant to your system have been applied. Bugs fixed (https://bugzilla.redhat.com/):
1357247 - rhvh 4: reboot after install shows "4m[terminated]" and takes long to reboot 1374007 - [RFE] RHV-H does not default to LVM Thin Provisioning 1420068 - [RFE] RHV-H should meet NIST 800-53 partitioning requirements by default 1422676 - [Test Only] Test Ansible playbook for registration 1429485 - [RFE] Imgbased layers should be named with '%{name}-%{version}-%{release}' instead of %{name}-%{version} 1433394 - kdump could fill up /var filesystem while writing to /var/crash 1443965 - Libvirt is disabled on RHVH host 1454536 - HostedEngine setup fails if RHV-H timezone < UTC set during installation 1474268 - RHVH host displays "upgrade available" information on the engine after registering until an update is released 1489567 - Host Software tab does not show exact RHVH version anymore 1501161 - The version displays as "4.1" for subscribed product with RHVH 4.2 1502920 - File missing after upgrade of RHVH node from version RHVH-4.1-20170925.0 to latest. 1503148 - [RFE] translate between basic ntp configurations and chrony configurations 1516123 - tuned-adm timeout while adding the host in manager and the deployment will fail/take time to complete 1534855 - RHVH brand is missing on cockpit login screen. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512
============================================================================= FreeBSD-SA-18:06.debugreg Security Advisory The FreeBSD Project
Topic: Mishandling of x86 debug exceptions
Category: core Module: kernel Announced: 2018-05-08 Credits: Nick Peterson, Everdox Tech LLC https://www.linkedin.com/in/everdox Andy Lutomirski Affects: All supported versions of FreeBSD. Corrected: 2018-05-08 17:03:33 UTC (stable/11, 11.2-PRERELEASE) 2018-05-08 17:12:10 UTC (releng/11.1, 11.1-RELEASE-p10) 2018-05-08 17:05:39 UTC (stable/10, 10.4-STABLE) 2018-05-08 17:12:10 UTC (releng/10.4, 10.4-RELEASE-p9) CVE Name: CVE-2018-8897
For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . Background
On x86 architecture systems, the stack is represented by the combination of a stack segment and a stack pointer, which must remain in sync for proper operation. Instructions related to manipulating the stack segment have special handling to facilitate consistency with changes to the stack pointer.
II. If that instruction is a system call or similar instruction that transfers control to the operating system, the debug exception will be handled in the kernel context instead of the user context.
III. Impact
An authenticated local attacker may be able to read sensitive data in kernel memory, control low-level operating system functions, or may panic the system.
IV. Workaround
No workaround is available.
V. Solution
Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, using either a binary or source code patch, and then reboot.
1) To update your vulnerable system via a binary patch:
Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility:
freebsd-update fetch
freebsd-update install
And reboot.
2) To update your vulnerable system via a source code patch:
The following patches have been verified to apply to the applicable FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.
[FreeBSD 11.1]
fetch https://security.FreeBSD.org/patches/SA-18:06/debugreg.11.1.patch
fetch https://security.FreeBSD.org/patches/SA-18:06/debugreg.11.1.patch.asc
gpg --verify debugreg.11.1.patch.asc
[FreeBSD 10.4]
fetch https://security.FreeBSD.org/patches/SA-18:06/debugreg.10.4.patch
fetch https://security.FreeBSD.org/patches/SA-18:06/debugreg.10.4.patch.asc
gpg --verify debugreg.10.4.patch.asc
b) Apply the patch. Execute the following commands as root:
cd /usr/src
patch < /path/to/patch
c) Recompile and install your kernel as described in and reboot the system.
VI. Correction details
The following list contains the correction revision numbers for each affected branch.
Branch/path Revision
stable/10/ r333370 releng/10.4/ r333371 stable/11/ r333369 releng/11.1/ r333371
To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed:
svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:
VII. 6.7) - i386, ppc64, s390x, x86_64
Bug Fix(es):
-
The kernel build requirements have been updated to the GNU Compiler Collection (GCC) compiler version that has the support for Retpolines. The Retpolines mechanism is a software construct that leverages specific knowledge of the underlying hardware to mitigate the branch target injection, also known as Spectre variant 2 vulnerability described in CVE-2017-5715. (BZ#1554253)
-
6.4) - x86_64
-
(BZ#1554251)
4
Show details on source website{
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"author": "CNNVD",
"id": "CNNVD-201805-208",
"trust": 0.6,
"value": "HIGH"
},
{
"author": "VULHUB",
"id": "VHN-138929",
"trust": 0.1,
"value": "HIGH"
},
{
"author": "VULMON",
"id": "CVE-2018-8897",
"trust": 0.1,
"value": "HIGH"
}
]
}
],
"sources": [
{
"db": "CERT/CC",
"id": "VU#631579"
},
{
"db": "VULHUB",
"id": "VHN-138929"
},
{
"db": "VULMON",
"id": "CVE-2018-8897"
},
{
"db": "CNNVD",
"id": "CNNVD-201805-208"
},
{
"db": "NVD",
"id": "CVE-2018-8897"
}
]
},
"description": {
"_id": null,
"data": "A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer\u0027s Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL \u003c 3, the debug exception is delivered after the transfer to CPL \u003c 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs. In some circumstances, some operating systems or hypervisors may not expect or properly handle an Intel architecture hardware debug exception. Microsoft Windows is prone to a local privilege-escalation vulnerability. \nAn attacker can exploit this issue to execute arbitrary code with elevated privileges. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n=====================================================================\n Red Hat Security Advisory\n\nSynopsis: Important: kernel security update\nAdvisory ID: RHSA-2018:1347-01\nProduct: Red Hat Enterprise Linux\nAdvisory URL: https://access.redhat.com/errata/RHSA-2018:1347\nIssue date: 2018-05-08\nCVE Names: CVE-2018-1087 CVE-2018-8897 CVE-2018-1000199 \n=====================================================================\n\n1. Summary:\n\nAn update for kernel is now available for Red Hat Enterprise Linux 7.2\nAdvanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update\nSupport, and Red Hat Enterprise Linux 7.2 Update Services for SAP\nSolutions. \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 Server AUS (v. 7.2) - noarch, x86_64\nRed Hat Enterprise Linux Server E4S (v. 7.2) - noarch, ppc64le, x86_64\nRed Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64\nRed Hat Enterprise Linux Server Optional E4S (v. 7.2) - ppc64le, x86_64\nRed Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64\nRed Hat Enterprise Linux Server TUS (v. 7.2) - noarch, x86_64\n\n3. Description:\n\nThe kernel packages contain the Linux kernel, the core of any Linux\noperating system. \n\nSecurity Fix(es):\n\n* Kernel: KVM: error in exception handling leads to wrong debug stack value\n(CVE-2018-1087)\n\n* Kernel: error in exception handling leads to DoS (CVE-2018-8897)\n\n* kernel: ptrace() incorrect error handling leads to corruption and DoS\n(CVE-2018-1000199)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, and other related information, refer to the CVE page(s) listed in\nthe References section. \n\nRed Hat would like to thank Andy Lutomirski for reporting CVE-2018-1087 and\nCVE-2018-1000199 and Nick Peterson (Everdox Tech LLC) and Andy Lutomirski\nfor reporting CVE-2018-8897. \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\nThe system must be rebooted for this update to take effect. \n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1566837 - CVE-2018-1087 Kernel: KVM: error in exception handling leads to wrong debug stack value\n1567074 - CVE-2018-8897 Kernel: error in exception handling leads to DoS\n1568477 - CVE-2018-1000199 kernel: ptrace() incorrect error handling leads to corruption and DoS\n\n6. Package List:\n\nRed Hat Enterprise Linux Server AUS (v. 7.2):\n\nSource:\nkernel-3.10.0-327.66.3.el7.src.rpm\n\nnoarch:\nkernel-abi-whitelists-3.10.0-327.66.3.el7.noarch.rpm\nkernel-doc-3.10.0-327.66.3.el7.noarch.rpm\n\nx86_64:\nkernel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-devel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-devel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-headers-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-libs-3.10.0-327.66.3.el7.x86_64.rpm\nperf-3.10.0-327.66.3.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server E4S (v. 7.2):\n\nSource:\nkernel-3.10.0-327.66.3.el7.src.rpm\n\nnoarch:\nkernel-abi-whitelists-3.10.0-327.66.3.el7.noarch.rpm\nkernel-doc-3.10.0-327.66.3.el7.noarch.rpm\n\nppc64le:\nkernel-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-bootwrapper-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-debug-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-debug-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-debuginfo-common-ppc64le-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-devel-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-headers-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-tools-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-tools-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-tools-libs-3.10.0-327.66.3.el7.ppc64le.rpm\nperf-3.10.0-327.66.3.el7.ppc64le.rpm\nperf-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\npython-perf-3.10.0-327.66.3.el7.ppc64le.rpm\npython-perf-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\n\nx86_64:\nkernel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-devel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-devel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-headers-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-libs-3.10.0-327.66.3.el7.x86_64.rpm\nperf-3.10.0-327.66.3.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server TUS (v. 7.2):\n\nSource:\nkernel-3.10.0-327.66.3.el7.src.rpm\n\nnoarch:\nkernel-abi-whitelists-3.10.0-327.66.3.el7.noarch.rpm\nkernel-doc-3.10.0-327.66.3.el7.noarch.rpm\n\nx86_64:\nkernel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debug-devel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-devel-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-headers-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-libs-3.10.0-327.66.3.el7.x86_64.rpm\nperf-3.10.0-327.66.3.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional AUS (v. 7.2):\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-327.66.3.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional E4S (v. 7.2):\n\nppc64le:\nkernel-debug-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-debug-devel-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-debuginfo-common-ppc64le-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-tools-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\nkernel-tools-libs-devel-3.10.0-327.66.3.el7.ppc64le.rpm\nperf-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\npython-perf-debuginfo-3.10.0-327.66.3.el7.ppc64le.rpm\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-327.66.3.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional TUS (v. 7.2):\n\nx86_64:\nkernel-debug-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-debuginfo-common-x86_64-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\nkernel-tools-libs-devel-3.10.0-327.66.3.el7.x86_64.rpm\nperf-debuginfo-3.10.0-327.66.3.el7.x86_64.rpm\npython-perf-debuginfo-3.10.0-327.66.3.el7.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-2018-1087\nhttps://access.redhat.com/security/cve/CVE-2018-8897\nhttps://access.redhat.com/security/cve/CVE-2018-1000199\nhttps://access.redhat.com/security/updates/classification/#important\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 2018 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n\niD8DBQFa8hjAXlSAg2UNWIIRAkH1AKCosff5yYgtYpdAUcf3SnlQOGVZfgCgiEYR\ng6/4/EzMBa+lSt9QhxSqC18=\n=IYAU\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n. These CVEs are both related to the way that\nthe linux kernel handles certain interrupt and exception instructions. The issue\ncan be triggered by an unprivileged user. \n\nThe fix for this problem requires modification of the interrupt descriptor\ntables (IDT), and modification of the interrupt handlers. Livepatch is \nunable to safely modify these areas, so upgrading to a corrected kernel\nand rebooting is required to fix the problem. \n\nReferences:\nCVE-2018-1087, CVE-2018-8897\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. Description:\n\nThe kernel-rt packages provide the Real Time Linux Kernel, which enables\nfine-tuning for systems with extremely high determinism requirements. \n\nBug Fix(es):\n\n* The kernel-rt packages have been upgraded to the 3.10.0-862.2.3 source\ntree, which provides a number of bug fixes over the previous version. \n(BZ#1549768)\n\n4. Intel Architecture (processor architecture) is a CPU specification developed by Intel Corporation for its processor. There are security vulnerabilities in the operating systems of multiple vendors. Systems from the following vendors are affected: Apple; DragonFly BSD Project; FreeBSD Project; Linux Kernel; Microsoft; Red Hat; SUSE Linux; Ubuntu; Vmware; Xen. \n\nCVE-2018-10471\n\n An error was discovered in the mitigations against Meltdown which\n could result in denial of service. \n\nCVE-2018-10472\n\n Anthony Perard discovered that incorrect parsing of CDROM images\n can result in information disclosure. \n\nCVE-2018-10981\n\n Jan Beulich discovered that malformed device models could result\n in denial of service. \n\nCVE-2018-10982\n\n Roger Pau Monne discovered that incorrect handling of high precision\n event timers could result in denial of service and potentially\n privilege escalation. \n\nFor the stable distribution (stretch), these problems have been fixed in\nversion 4.8.3+comet2+shim4.10.0+comet3-1+deb9u6. \n\nWe recommend that you upgrade your xen packages. \n\nFor the detailed security status of xen please refer to\nits security tracker page at:\nhttps://security-tracker.debian.org/tracker/xen\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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\np+140rFiElDCUkHacCmfs4zWQ+/ZLcoAppIxvxDEZYWyRJp3qgU=\n=KAUD\n-----END PGP SIGNATURE-----\n. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA512\n\nAPPLE-SA-2018-05-08-1 Additional information for\nAPPLE-SA-2018-04-24-2 Security Update 2018-001\n\nSecurity Update 2018-001 addresses the following:\n\nCrash Reporter\nAvailable for: macOS High Sierra 10.13.4\nImpact: An application may be able to gain elevated privileges\nDescription: A memory corruption issue was addressed with improved\nerror handling. The issue appears to be from an\nundocumented side effect of the instructions. \nCVE-2018-8897: Andy Lutomirski, Nick Peterson\n(linkedin.com/in/everdox) of Everdox Tech LLC\nEntry added May 8, 2018\n\nLinkPresentation\nAvailable for: macOS High Sierra 10.13.4\nImpact: Processing a maliciously crafted text message may lead to UI\nspoofing\nDescription: A spoofing issue existed in the handling of URLs. This\nissue was addressed with improved input validation. ==========================================================================\nUbuntu Security Notice USN-3641-2\nMay 08, 2018\n\nlinux, linux-lts-trusty vulnerabilities\n==========================================================================\n\nA security issue affects these releases of Ubuntu and its derivatives:\n\n- Ubuntu 12.04 ESM\n\nSummary:\n\nSeveral security issues were fixed in the Linux kernel. This update provides the\ncorresponding updates for Ubuntu 12.04 ESM. A local attacker\ncould use this to cause a denial of service (system crash). This issue only\naffected the amd64 architecture. A local attacker in a KVM virtual machine could use this to\ncause a denial of service (guest VM crash) or possibly escalate privileges\ninside of the virtual machine. This issue only affected the i386 and amd64\narchitectures. (CVE-2018-1087)\n\nAndy Lutomirski discovered that the Linux kernel did not properly perform\nerror handling on virtualized debug registers. (CVE-2018-1000199)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 12.04 ESM:\n linux-image-3.13.0-147-generic 3.13.0-147.196~precise1\n linux-image-3.13.0-147-generic-lpae 3.13.0-147.196~precise1\n linux-image-3.2.0-134-generic 3.2.0-134.180\n linux-image-3.2.0-134-generic-pae 3.2.0-134.180\n linux-image-3.2.0-134-highbank 3.2.0-134.180\n linux-image-3.2.0-134-omap 3.2.0-134.180\n linux-image-3.2.0-134-powerpc-smp 3.2.0-134.180\n linux-image-3.2.0-134-powerpc64-smp 3.2.0-134.180\n linux-image-3.2.0-134-virtual 3.2.0-134.180\n linux-image-generic 3.2.0.134.149\n linux-image-generic-lpae-lts-trusty 3.13.0.147.138\n linux-image-generic-lts-trusty 3.13.0.147.138\n linux-image-generic-pae 3.2.0.134.149\n linux-image-highbank 3.2.0.134.149\n linux-image-omap 3.2.0.134.149\n linux-image-powerpc 3.2.0.134.149\n linux-image-powerpc-smp 3.2.0.134.149\n linux-image-powerpc64-smp 3.2.0.134.149\n\nAfter a standard system update you need to reboot your computer to make\nall the necessary changes. \n\nATTENTION: Due to an unavoidable ABI change the kernel updates have\nbeen given a new version number, which requires you to recompile and\nreinstall all third party kernel modules you might have installed. \nUnless you manually uninstalled the standard kernel metapackages\n(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,\nlinux-powerpc), a standard system upgrade will automatically perform\nthis as well. Summary:\n\nUpdated redhat-virtualization-host packages that fix several bugs and add\nvarious enhancements are now available. These packages include redhat-release-virtualization-host,\novirt-node, and rhev-hypervisor. RHVH features a Cockpit user\ninterface for monitoring the host\u0027s resources and performing administrative\ntasks. \n\nIncludes GlusterFS fixes for CVE-2018-1088, dhcp fixes for CVE-2018-1111,\nkernel fixes for CVE-2018-1087, and kernel fixes for CVE-2018-8897. \n\nA list of bugs fixed in this update is available in the Technical Notes\nbook:\nhttps://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/ht\nml/technical_notes/\n\n4. Solution:\n\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied. Bugs fixed (https://bugzilla.redhat.com/):\n\n1357247 - rhvh 4: reboot after install shows \"4m[terminated]\" and takes long to reboot\n1374007 - [RFE] RHV-H does not default to LVM Thin Provisioning\n1420068 - [RFE] RHV-H should meet NIST 800-53 partitioning requirements by default\n1422676 - [Test Only] Test Ansible playbook for registration\n1429485 - [RFE] Imgbased layers should be named with \u0027%{name}-%{version}-%{release}\u0027 instead of %{name}-%{version}\n1433394 - kdump could fill up /var filesystem while writing to /var/crash\n1443965 - Libvirt is disabled on RHVH host\n1454536 - HostedEngine setup fails if RHV-H timezone \u003c UTC set during installation\n1474268 - RHVH host displays \"upgrade available\" information on the engine after registering until an update is released\n1489567 - Host Software tab does not show exact RHVH version anymore\n1501161 - The version displays as \"4.1\" for subscribed product with RHVH 4.2\n1502920 - File missing after upgrade of RHVH node from version RHVH-4.1-20170925.0 to latest. \n1503148 - [RFE] translate between basic ntp configurations and chrony configurations\n1516123 - tuned-adm timeout while adding the host in manager and the deployment will fail/take time to complete\n1534855 - RHVH brand is missing on cockpit login screen. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA512\n\n=============================================================================\nFreeBSD-SA-18:06.debugreg Security Advisory\n The FreeBSD Project\n\nTopic: Mishandling of x86 debug exceptions\n\nCategory: core\nModule: kernel\nAnnounced: 2018-05-08\nCredits: Nick Peterson, Everdox Tech LLC\n https://www.linkedin.com/in/everdox\n Andy Lutomirski\nAffects: All supported versions of FreeBSD. \nCorrected: 2018-05-08 17:03:33 UTC (stable/11, 11.2-PRERELEASE)\n 2018-05-08 17:12:10 UTC (releng/11.1, 11.1-RELEASE-p10)\n 2018-05-08 17:05:39 UTC (stable/10, 10.4-STABLE)\n 2018-05-08 17:12:10 UTC (releng/10.4, 10.4-RELEASE-p9)\nCVE Name: CVE-2018-8897\n\nFor general information regarding FreeBSD Security Advisories,\nincluding descriptions of the fields above, security branches, and the\nfollowing sections, please visit \u003cURL:https://security.FreeBSD.org/\u003e. Background\n\nOn x86 architecture systems, the stack is represented by the combination of\na stack segment and a stack pointer, which must remain in sync for proper\noperation. Instructions related to manipulating the stack segment have\nspecial handling to facilitate consistency with changes to the stack pointer. \n\nII. If that instruction is\na system call or similar instruction that transfers control to the operating\nsystem, the debug exception will be handled in the kernel context instead of\nthe user context. \n\nIII. Impact\n\nAn authenticated local attacker may be able to read sensitive data in kernel\nmemory, control low-level operating system functions, or may panic the\nsystem. \n\nIV. Workaround\n\nNo workaround is available. \n\nV. Solution\n\nUpgrade your vulnerable system to a supported FreeBSD stable or\nrelease / security branch (releng) dated after the correction date,\nusing either a binary or source code patch, and then reboot. \n\n1) To update your vulnerable system via a binary patch:\n\nSystems running a RELEASE version of FreeBSD on the i386 or amd64\nplatforms can be updated via the freebsd-update(8) utility:\n\n# freebsd-update fetch\n# freebsd-update install\n\nAnd reboot. \n\n2) To update your vulnerable system via a source code patch:\n\nThe following patches have been verified to apply to the applicable\nFreeBSD release branches. \n\na) Download the relevant patch from the location below, and verify the\ndetached PGP signature using your PGP utility. \n\n[FreeBSD 11.1]\n# fetch https://security.FreeBSD.org/patches/SA-18:06/debugreg.11.1.patch\n# fetch https://security.FreeBSD.org/patches/SA-18:06/debugreg.11.1.patch.asc\n# gpg --verify debugreg.11.1.patch.asc\n\n[FreeBSD 10.4]\n# fetch https://security.FreeBSD.org/patches/SA-18:06/debugreg.10.4.patch\n# fetch https://security.FreeBSD.org/patches/SA-18:06/debugreg.10.4.patch.asc\n# gpg --verify debugreg.10.4.patch.asc\n\nb) Apply the patch. Execute the following commands as root:\n\n# cd /usr/src\n# patch \u003c /path/to/patch\n\nc) Recompile and install your kernel as described in\n\u003cURL:https://www.FreeBSD.org/handbook/kernelconfig.html\u003e and reboot the\nsystem. \n\nVI. Correction details\n\nThe following list contains the correction revision numbers for each\naffected branch. \n\nBranch/path Revision\n- -------------------------------------------------------------------------\nstable/10/ r333370\nreleng/10.4/ r333371\nstable/11/ r333369\nreleng/11.1/ r333371\n- -------------------------------------------------------------------------\n\nTo see which files were modified by a particular revision, run the\nfollowing command, replacing NNNNNN with the revision number, on a\nmachine with Subversion installed:\n\n# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base\n\nOr visit the following URL, replacing NNNNNN with the revision number:\n\n\u003cURL:https://svnweb.freebsd.org/base?view=revision\u0026revision=NNNNNN\u003e\n\nVII. 6.7) - i386, ppc64, s390x, x86_64\n\n3. \n\nBug Fix(es):\n\n* The kernel build requirements have been updated to the GNU Compiler\nCollection (GCC) compiler version that has the support for Retpolines. The\nRetpolines mechanism is a software construct that leverages specific\nknowledge of the underlying hardware to mitigate the branch target\ninjection, also known as Spectre variant 2 vulnerability described in\nCVE-2017-5715. (BZ#1554253)\n\n4. 6.4) - x86_64\n\n3. (BZ#1554251)\n\n4",
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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.