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[gentoo-announce] [ GLSA 201207-04 ] X.Org X Server: Privilege escalation

Posted on 10 July 2012
Gentoo-announce

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Gentoo Linux Security Advisory GLSA 201207-04
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http://security.gentoo.org/
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Severity: High
Title: X.Org X Server: Privilege escalation
Date: July 09, 2012
Bugs: #412609
ID: 201207-04

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Synopsis
========
A format string vulnerability in X.Org X Server may allow local
privilege escalation or Denial of Service.

Background
==========
The X Window System is a graphical windowing system based on a
client/server model.

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 x11-base/xorg-server < 1.11.4-r1 >= 1.11.4-r1
*>= 1.10.6-r1
*<= 1.9.5-r1

Description
===========
The "LogVHdrMessageVerb()" function in log.c contains a format string
vulnerability.

NOTE: Exposure to this vulnerability is reduced in Gentoo due to X.Org
X Server being built with "-D_FORTIFY_SOURCE=2" by default.

Impact
======
A local attacker could gain escalated privileges or cause a Denial of
Service condition.

Workaround
==========
There is no known workaround at this time.

Resolution
==========
All X.Org X Server 1.11.x users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.11.4-r1"=

All X.Org X Server 1.10.x users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.10.6-r1"=

X.Org X Server 1.9.x is not affected.

References
==========
[ 1 ] CVE-2012-2118
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-2118

Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-201207-04.xml

Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======
Copyright 2012 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5


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