libxml2: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 201203-04 / libxml2
Release Date	March 06, 2012
Latest Revision	March 06, 2012: 1
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
dev-libs/libxml2	< 2.7.8-r5	>= 2.7.8-r5	All supported architectures

Related bugreports: #405261

Synopsis

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

2. Impact Information

Background

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

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All libxml2 users should upgrade to the latest version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-libs/libxml2-2.7.8-r5"

4. References

CVE-2012-0841

Page updated March 06, 2012

Summary: This is a Gentoo Linux Security Advisory

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