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Alerts This Week
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Red Hat 7 RHSA-2014:0923-01 Critical: Kernel Privilege Escalation

red hat
Calendar Grey July 23, 2014
Scroller Redhat
Latest kernel patch released by Red Hat rectifying severe security vulnerabilities that could lead to elevated privileges and potential system crashes.
Updated kernel packages that fix two security issues are now available for Red Hat Enterprise Linux 7

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258

To install kernel packages manually, use "rpm -ivh [package]". Do not use "rpm -Uvh" as that will remove the running kernel binaries from your system. You may use "rpm -e" to remove old kernels after determining that the new kernel functions properly on your system.

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
* It was found that the Linux kernel's ptrace subsystem allowed a traced process' instruction pointer to be set to a non-canonical memory address without forcing the non-sysret code path when returning to user space. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2014-4699, Important)
Note: The CVE-2014-4699 issue only affected systems using an Intel CPU.
* A flaw was found in the way the pppol2tp_setsockopt() and pppol2tp_getsockopt() functions in the Linux kernel's PPP over L2TP implementation handled requests with a non-SOL_PPPOL2TP socket option level. A local, unprivileged user could use this flaw to escalate their privileges on the system. (CVE-2014-4943, Important)
Red Hat would like to thank Andy Lutomirski for reporting CVE-2014-4699, and Sasha Levin for reporting CVE-2014-4943.
All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Topics%20covered

Topics Covered

security advisory security issue privilege escalation important kernel red hat enterprise linux update

References

https://access.redhat.com/security/cve/CVE-2014-4699 https://access.redhat.com/security/cve/CVE-2014-4943 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: kernel-3.10.0-123.4.4.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-123.4.4.el7.noarch.rpm
x86_64: kernel-3.10.0-123.4.4.el7.x86_64.rpm kernel-debug-3.10.0-123.4.4.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm kernel-debug-devel-3.10.0-123.4.4.el7.x86_64.rpm kernel-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-123.4.4.el7.x86_64.rpm kernel-devel-3.10.0-123.4.4.el7.x86_64.rpm kernel-headers-3.10.0-123.4.4.el7.x86_64.rpm kernel-tools-3.10.0-123.4.4.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm kernel-tools-libs-3.10.0-123.4.4.el7.x86_64.rpm perf-3.10.0-123.4.4.el7.x86_64.rpm perf-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm python-perf-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
noarch: kernel-doc-3.10.0-123.4.4.el7.noarch.rpm
x86_64: kernel-debug-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm kernel-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-123.4.4.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-123.4.4.el7.x86_64.rpm perf-debuginfo-3.10.0-123.4.4.el7.x86_64.rpm python-perf-3.10.0-123.4.4.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2014:0923-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2014:0923.html
Issue date: 2014-07-23

Topic

Updated kernel packages that fix two security issues are now available forRed Hat Enterprise Linux 7.The Red Hat Security Response Team has rated this update as havingImportant security impact. Common Vulnerability Scoring System (CVSS) basescores, which give detailed severity ratings, are available for eachvulnerability from the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory security issue privilege escalation important kernel red hat enterprise linux update

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64

Bugs Fixed

1115927 - CVE-2014-4699 kernel: x86_64: ptrace: sysret to non-canonical address

1119458 - CVE-2014-4943 kernel: net: pppol2tp: level handling in pppol2tp_[s,g]etsockopt()

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