bugtraq - [ GLSA 201009-07 ] libxml2: Denial of Service

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Message-ID: <4C9926A6.9090603@gentoo.org>
Date: Tue, 21 Sep 2010 23:41:58 +0200
From: Stefan Behte <craig@...too.org>
To: gentoo-announce@...too.org, bugtraq@...urityfocus.com,
	full-disclosure@...ts.grok.org.uk, security-alerts@...uxsecurity.com
Subject: [ GLSA 201009-07 ] libxml2: Denial of Service

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Gentoo Linux Security Advisory                           GLSA 201009-07
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: libxml2: Denial of Service
      Date: September 21, 2010
      Bugs: #280617
        ID: 201009-07

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Synopsis
========

Multiple Denial of Services vulnerabilities were found in libxml2.

Background
==========

libxml2 is a library to manipulate XML files.

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  dev-libs/libxml2     < 2.7.3-r2                       >= 2.7.3-r2

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

The following vulnerabilities were reported after a test with the
Codenomicon XML fuzzing framework:

* Two use-after-free vulnerabilities are possible when parsing a XML
  file with Notation or Enumeration attribute types (CVE-2009-2416).

* A stack consumption vulnerability can be triggered via a large
  depth of element declarations in a DTD, related to a function
  recursion (CVE-2009-2414).

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/libxml2-2.7.3-r2"

NOTE: This is a legacy GLSA. Updates for all affected architectures are
available since August 30, 2009. It is likely that your system is
already no longer affected by this issue.

References
==========

  [ 1 ] CVE-2009-2414
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2414
  [ 2 ] CVE-2009-2416
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2416

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

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

  http://security.gentoo.org/glsa/glsa-201009-07.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@...too.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2010 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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