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Red Hat RHSA-2012:0061-01 Critical: Kernel-RT Privilege Escalation

red hat
Calendar Grey January 24, 2012
Scroller Redhat
Newly released kernel-rt updates for Red Hat address serious vulnerabilities. Significant security risks have been uncovered. Perform the upgrade immediately!
Updated kernel-rt packages that fix one security issue are now available for Red Hat Enterprise MRG 2.1

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/kb/docs/DOC-11259

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-rt packages contain the Linux kernel, the core of any Linux operating system.
This update fixes the following security issue:
* It was found that permissions were not checked properly in the Linux kernel when handling the /proc/[pid]/mem writing functionality. A local, unprivileged user could use this flaw to escalate their privileges. Refer to Red Hat Knowledgebase article DOC-69129, linked to in the References, for further information. (CVE-2012-0056, Important)
Red Hat would like to thank Jüri Aedla for reporting this issue.
Users should upgrade to these updated packages, which correct this issue. The system must be rebooted for this update to take effect.

Topics%20covered

Topics Covered

security advisory Red Hat privilege escalation kernel-rt important security update

References

https://access.redhat.com/security/cve/CVE-2012-0056 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/kb/docs/DOC-69129

Package List

MRG Realtime for RHEL 6 Server v.2:
Source:
noarch: kernel-rt-doc-3.0.9-rt26.46.el6rt.noarch.rpm kernel-rt-firmware-3.0.9-rt26.46.el6rt.noarch.rpm
x86_64: kernel-rt-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-debug-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-debug-devel-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-debuginfo-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-devel-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-trace-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-trace-devel-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-vanilla-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.0.9-rt26.46.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.0.9-rt26.46.el6rt.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#package


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2012:0061-01
Product: Red Hat Enterprise MRG for RHEL-6
Advisory URL: https://access.redhat.com/errata/RHSA-2012:0061.html
Issue date: 2012-01-24

Topic

Updated kernel-rt packages that fix one security issue are now availablefor Red Hat Enterprise MRG 2.1.The Red Hat Security Response Team has rated this update as havingimportant security impact. A Common Vulnerability Scoring System (CVSS)base score, which gives a detailed severity rating, is available from theCVE link in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat privilege escalation kernel-rt important security update

Relevant Releases Architectures

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

Bugs Fixed

782642 - CVE-2012-0056 kernel: proc: /proc//mem mem_write insufficient permission checking

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