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Red Hat 6.4 Important Advisory RHSA-2016:2133-01 Privilege Escalation

red hat
Calendar Grey November 1, 2016
Scroller Redhat
Critical kernel security patch for CentOS, targeting vulnerabilities in privilege escalation and additional security flaws.
An update for kernel is now available for Red Hat Enterprise Linux 6.4 Advanced Update Support

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.

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* A race condition was found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged, local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system. (CVE-2016-5195, Important)
* A flaw was found in the Linux kernel's keyring handling code: the key_reject_and_link() function could be forced to free an arbitrary memory block. An attacker could use this flaw to trigger a use-after-free condition on the system, potentially allowing for privilege escalation. (CVE-2016-4470, Important)
Red Hat would like to thank Phil Oester for reporting CVE-2016-5195. The CVE-2016-4470 issue was discovered by David Howells (Red Hat).

Topics%20covered

Topics Covered

security advisory Red Hat privilege escalation security fix important kernel memory handling

References

https://access.redhat.com/security/cve/CVE-2016-4470 https://access.redhat.com/security/cve/CVE-2016-5195 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Server AUS (v. 6.4):
Source: kernel-2.6.32-358.75.1.el6.src.rpm
noarch: kernel-doc-2.6.32-358.75.1.el6.noarch.rpm kernel-firmware-2.6.32-358.75.1.el6.noarch.rpm
x86_64: kernel-2.6.32-358.75.1.el6.x86_64.rpm kernel-debug-2.6.32-358.75.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-358.75.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.75.1.el6.x86_64.rpm kernel-devel-2.6.32-358.75.1.el6.x86_64.rpm kernel-headers-2.6.32-358.75.1.el6.x86_64.rpm perf-2.6.32-358.75.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 6.4):
Source: kernel-2.6.32-358.75.1.el6.src.rpm
x86_64: kernel-debug-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.75.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm python-perf-2.6.32-358.75.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.75.1.el6.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


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:2133-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:2133.html
Issue date: 2016-11-01

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.4Advanced Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat privilege escalation security fix important kernel memory handling

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 6.4) - noarch, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - x86_64

Bugs Fixed

1341716 - CVE-2016-4470 kernel: Uninitialized variable in request_key handling causes kernel crash in error handling path

1384344 - CVE-2016-5195 kernel: mm: privilege escalation via MAP_PRIVATE COW breakage

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