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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