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Gentoo Linux Security Advisory                           GLSA 200701-25
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: X.Org X server: Multiple vulnerabilities
      Date: January 27, 2007
      Bugs: #157421
        ID: 200701-25

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Synopsis
========

Sean Larsson from iDefense Labs has found multiple vulnerabilities in
the DBE and Render extensions.

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     < 1.1.1-r4                   >= 1.1.1-r4

Description
===========

Multiple memory corruption vulnerabilities have been found in the
ProcDbeGetVisualInfo() and the ProcDbeSwapBuffers() of the DBE
extension, and ProcRenderAddGlyphs() in the Render extension.

Impact
======

A local attacker could execute arbitrary code with the privileges of
the user running the X server, typically root.

Workaround
==========

Disable the dbe and render extension by removing the "Load dbe" and
"Load render" directives in the Module section of xorg.conf.

Note: This could affect the functionality of some applications.

Resolution
==========

All X.Org X server users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.1.1-r4"

References
==========

  [ 1 ] CVE-2006-6101
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6101
  [ 2 ] CVE-2006-6102
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6102
  [ 3 ] CVE-2006-6103
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6103

Availability
============

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

  http://security.gentoo.org/glsa/glsa-200701-25.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
http://bugs.gentoo.org.

License
=======

Copyright 2007 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