A new security update has been released for Gentoo Linux - libxml2: Multiple vulnerabilities. Here the announcement:

Gentoo Linux Security Advisory GLSA 200812-06
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http://security.gentoo.org/
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Severity: Normal
Title: libxml2: Multiple vulnerabilities
Date: December 02, 2008
Bugs: #234099, #237806, #239346, #245960
ID: 200812-06

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Synopsis
========

Multiple vulnerabilities in libxml2 might lead to execution of
arbitrary code or Denial of Service.

Background
==========

libxml2 is the XML (eXtended Markup Language) C parser and toolkit
initially developed for the Gnome project.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-libs/libxml2 < 2.7.2-r1 >= 2.7.2-r1

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

Multiple vulnerabilities were reported in libxml2:

* Andreas Solberg reported that libxml2 does not properly detect
recursion during entity expansion in an attribute value
(CVE-2008-3281).

* A heap-based buffer overflow has been reported in the
xmlParseAttValueComplex() function in parser.c (CVE-2008-3529).

* Christian Weiske reported that predefined entity definitions in
entities are not properly handled (CVE-2008-4409).

* Drew Yao of Apple Product Security reported an integer overflow in
the xmlBufferResize() function that can lead to an infinite loop
(CVE-2008-4225).

* Drew Yao of Apple Product Security reported an integer overflow in
the xmlSAX2Characters() function leading to a memory corruption
(CVE-2008-4226).

Impact
======

A remote attacker could entice a user or automated system to open a
specially crafted XML document with an application using libxml2,
possibly resulting in the exeution of arbitrary code or a high CPU and
memory consumption.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libxml2 users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-libs/libxml2-2.7.2-r1"

References
==========

[ 1 ] CVE-2008-3281
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3281
[ 2 ] CVE-2008-3529
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3529
[ 3 ] CVE-2008-4409
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4409
[ 4 ] CVE-2008-4225
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4225
[ 5 ] CVE-2008-4226
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4226

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

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

http://security.gentoo.org/glsa/glsa-200812-06.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 2008 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