GLSA 201207-04: X.Org X Server: Privilege escalation

http://security.gentoo.org/

Severity:	high
Title:	X.Org X Server: Privilege escalation
Date:	07/09/2012
Bugs:	#412609
ID:	201207-04

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	Architecture(s)
x11-base/xorg-server	< 1.11.4-r1	>= 1.11.4-r1	All supported architectures

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

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.