From: Sune Kloppenborg Jeppesen <jaervosz@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200609-07 ] LibXfont, monolithic X.org: Multiple integer overflows
Date: Wed, 13 Sep 2006 19:08:42 +0200
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Organization: Gentoo Linux Security Team
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Gentoo Linux Security Advisory GLSA 200609-07
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http://security.gentoo.org/
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Severity: High
Title: LibXfont, monolithic X.org: Multiple integer overflows
Date: September 13, 2006
Bugs: #145513
ID: 200609-07
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Synopsis
========
Some buffer overflows were discovered in the CID font parser,
potentially resulting in the execution of arbitrary code with elevated
privileges.
Background
==========
libXfont is the X.Org Xfont library, some parts are based on the
FreeType code base.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 x11-libs/libXfont < 1.2.1 >= 1.2.1
2 x11-base/xorg-x11 < 7.0 >= 7.0
-------------------------------------------------------------------
2 affected packages on all of their supported architectures.
-------------------------------------------------------------------
Description
===========
Several integer overflows have been found in the CID font parser.
Impact
======
A remote attacker could exploit this vulnerability by enticing a user
to load a malicious font file resulting in the execution of arbitrary
code with the permissions of the user running the X server which
typically is the root user. A local user could exploit this
vulnerability to gain elevated privileges.
Workaround
==========
Disable CID-encoded Type 1 fonts by removing the "type1" module and
replacing it with the "freetype" module in xorg.conf.
Resolution
==========
All libXfont users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-libs/libXfont-1.2.1"
All monolithic X.org users are advised to migrate to modular X.org.
References
==========
[ 1 ] CVE-2006-3739
http://cve.mitre.org/cgi-bin/cvename.cgi?name=2006-3739
[ 2 ] CVE-2006-3740
http://cve.mitre.org/cgi-bin/cvename.cgi?name=2006-3740
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200609-07.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 2006 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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