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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 



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