Bug 908693 - (CVE-2013-0268) CVE-2013-0268 kernel: x86/msr: /dev/cpu/*/msr local privilege escalation
CVE-2013-0268 kernel: x86/msr: /dev/cpu/*/msr local privilege escalation
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20130124,repo...
: Security
Depends On: 908696 908697 908698 908699 908702 908703 908706
Blocks: 907435
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Reported: 2013-02-07 05:53 EST by Petr Matousek
Modified: 2015-02-16 10:53 EST (History)
25 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-03-27 08:45:55 EDT
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Description Petr Matousek 2013-02-07 05:53:05 EST
Access to /dev/cpu/*/msr was protected only using filesystem checks. A local uid 0 (root) user with all capabilities dropped could use this flaw to execute arbitrary code in kernel mode.

Upstream commit:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=c903f0456bc69176912dee6dd25c6a66ee1aed00

References:
http://grsecurity.net/~spender/msr32.c
Comment 3 Petr Matousek 2013-02-07 06:02:26 EST
Created kernel tracking bugs for this issue

Affects: fedora-all [bug 908706]
Comment 4 Fedora Update System 2013-02-08 11:56:30 EST
kernel-3.7.6-201.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 5 Petr Matousek 2013-02-11 14:16:48 EST
Statement:

This issue did affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.
Comment 6 errata-xmlrpc 2013-03-11 14:39:51 EDT
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2013:0622 https://rhn.redhat.com/errata/RHSA-2013-0622.html
Comment 7 errata-xmlrpc 2013-03-11 15:39:14 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:0621 https://rhn.redhat.com/errata/RHSA-2013-0621.html
Comment 8 errata-xmlrpc 2013-03-12 14:59:46 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0630 https://rhn.redhat.com/errata/RHSA-2013-0630.html

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