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To: gentoo-announce@g.o
From: Sean Amoss <ackle@g.o>
Subject: [ GLSA 201202-09 ] libxml2: User-assisted execution of arbitrary code
Date: Wed, 29 Feb 2012 15:23:08 -0500
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Gentoo Linux Security Advisory                           GLSA 201202-09
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: libxml2: User-assisted execution of arbitrary code
     Date: February 29, 2012
     Bugs: #398361
       ID: 201202-09

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Synopsis
========

A boundary error in libxml2 could result in execution of arbitrary code
or Denial of Service.

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-r4               >= 2.7.8-r4

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

The "xmlStringLenDecodeEntities()" function in parser.c contains a
boundary error which could possibly cause a heap-based buffer overflow.

Impact
======

A remote attacker could entice a user to open a specially crafted XML
file in an application linked against libxml2, possibly resulting in
the remote execution of arbitrary code with the permissions of the user
running the application, or Denial of Service.

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-r4"

Packages which depend on this library may need to be recompiled. Tools
such as revdep-rebuild may assist in identifying some of these
packages.

References
==========

[ 1 ] CVE-2011-3919
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-3919

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

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

 http://security.gentoo.org/glsa/glsa-201202-09.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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