[Full-disclosure] [ GLSA 200701-25 ] X.Org X server: Multiple vulnerabilities

[Matthias Geerdsen]

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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 at 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


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