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Gentoo Linux Security Advisory                           GLSA 200801-20
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: libxml2: Denial of Service
      Date: January 30, 2008
      Bugs: #202628
        ID: 200801-20

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Synopsis
========

A Denial of Service vulnerability has been reported in libxml2.

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      < 2.6.30-r1                    >= 2.6.30-r1

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

Brad Fitzpatrick reported that the xmlCurrentChar() function does not
properly handle some UTF-8 multibyte encodings.

Impact
======

A remote attacker could entice a user to open a specially crafted XML
document with an application using libxml2, possibly resulting in a
high CPU consumption. Note that this vulnerability could also be
triggered without user interaction by an automated system processing
XML content.

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/libxml2-2.6.30-r1"

References
==========

  [ 1 ] CVE-2007-6284
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6284

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

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

  http://security.gentoo.org/glsa/glsa-200801-20.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
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