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To: gentoo-announce@g.o
From: Sean Amoss <ackle@g.o>
Subject: [ GLSA 201203-04 ] libxml2: Denial of Service
Date: Mon, 05 Mar 2012 20:33:02 -0500
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Gentoo Linux Security Advisory                           GLSA 201203-04
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: libxml2: Denial of Service
     Date: March 06, 2012
     Bugs: #405261
       ID: 201203-04

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Synopsis
========

A hash collision vulnerability in libxml2 allows remote attackers to
cause a Denial of Service condition.

Background
==========

libxml2 is the XML C parser and toolkit developed for the Gnome
project.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-libs/libxml2            < 2.7.8-r5               >= 2.7.8-r5

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

libxml2 does not properly randomize hash functions to protect against
hash collision attacks.

Impact
======

A remote attacker could entice a user or automated system to open a
specially crafted XML document with an application using libxml2
resulting in a Denial of Service condition.

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/libxml2-2.7.8-r5"

References
==========

[ 1 ] CVE-2012-0841
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0841

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

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

 http://security.gentoo.org/glsa/glsa-201203-04.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@g.o or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2012 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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Updated Jun 25, 2012

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