GLSA 201009-07: libxml2: Denial of Service

http://security.gentoo.org/

Severity:	normal
Title:	libxml2: Denial of Service
Date:	09/21/2010
Bugs:	#280617
ID:	201009-07

Synopsis

Multiple Denial of Services vulnerabilities were found in libxml2.

Background

libxml2 is a library to manipulate XML files.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/libxml2	< 2.7.3-r2	>= 2.7.3-r2	All supported architectures

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

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.