[ GLSA 201110-19 ] X.Org X Server: Multiple vulnerabilities

[Alex Legler <a3li () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 201110-19
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: X.Org X Server: Multiple vulnerabilities
     Date: October 22, 2011
     Bugs: #387069
       ID: 201110-19

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Synopsis
========

Multiple vulnerabilities in the X.Org X server might allow local
attackers to disclose information.

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       < 1.10.4-r1              *>= 1.9.5-r1 
                                                         >= 1.10.4-r1 

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

vladz reported the following vulnerabilities in the X.Org X server:

* The X.Org X server follows symbolic links when trying to access the
  lock file for a X display, showing a predictable behavior depending
  on the file type of the link target (CVE-2011-4028).
* The X.Org X server lock file mechanism allows for a race condition to
  cause the X server to modify the file permissions of an arbitrary
  file to 0444 (CVE-2011-4029).

Impact
======

A local attacker could exploit these vulnerabilities to disclose
information by making arbitrary files on a system world-readable or
gain information whether a specified file exists on the system and
whether it is a file, directory, or a named pipe.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All X.Org X Server 1.9 users should upgrade to the latest 1.9 version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.9.5-r1"

All X.Org X Server 1.10 users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.10.4-r1"

References
==========

[ 1 ] CVE-2011-4028
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4028
[ 2 ] CVE-2011-4029
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4029

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

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

 http://security.gentoo.org/glsa/glsa-201110-19.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 2011 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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