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[gentoo-announce] [ GLSA 201009-07 ] libxml2: Denial of Service

Posted on 21 September 2010
Gentoo-announce

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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@gentoo.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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