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Gentoo Linux Security Advisory                           GLSA 200710-11
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http://security.gentoo.org/ 
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  Severity: High
     Title: X Font Server: Multiple Vulnerabilities
      Date: October 12, 2007
      Bugs: #185660, #194606
        ID: 200710-11

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Synopsis
=======
Three vulnerabilities have been discovered in the X Font Server
possibly allowing local attackers to gain elevated privileges.

Background
=========
The X.Org X11 X Font Server provides a standard mechanism for an X
server to communicate with a font renderer.

Affected packages
================
    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  x11-apps/xfs       < 1.0.5                               >= 1.0.5

Description
==========
iDefense reported that the xfs init script does not correctly handle a
race condition when setting permissions of a temporary file
(CVE-2007-3103). Sean Larsson discovered an integer overflow
vulnerability in the build_range() function possibly leading to a
heap-based buffer overflow when handling "QueryXBitmaps" and
"QueryXExtents" protocol requests (CVE-2007-4568). Sean Larsson also
discovered an error in the swap_char2b() function possibly leading to a
heap corruption when handling the same protocol requests
(CVE-2007-4990).

Impact
=====
The first issue would allow a local attacker to change permissions of
arbitrary files to be world-writable by performing a symlink attack.
The second and third issues would allow a local attacker to execute
arbitrary code with privileges of the user running the X Font Server,
usually xfs.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All X Font Server users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-apps/xfs-1.0.5"

References
=========
  [ 1 ] CVE-2007-3103
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3103 
  [ 2 ] CVE-2007-4568
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4568 
  [ 3 ] CVE-2007-4990
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4990 

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

http://security.gentoo.org/glsa/glsa-200710-11.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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