libxml2: User-assisted execution of arbitrary code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 201207-02 / libxml2
Release Date	July 09, 2012
Latest Revision	July 09, 2012: 1
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
dev-libs/libxml2	< 2.8.0_rc1	>= 2.8.0_rc1	All supported architectures

Related bugreports: #416209

Synopsis

A off-by-one error in libxml2 could result in execution of arbitrary code or Denial of Service.

2. Impact Information

Background

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

Description

The "xmlXPtrEvalXPtrPart()" function in xpointer.c contains an off-by-one error.

Impact

A remote attacker could entice a user or automated system to open a specially crafted XML document with an application using libxml2, possibly resulting in execution of arbitrary code or 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/libxml2-2.8.0_rc1"

4. References

CVE-2011-3102

Page updated July 09, 2012

Summary: This is a Gentoo Linux Security Advisory

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