libxslt: Denial of service

Background

libxslt is the XSLT C library developed for the GNOME project. XSLT is an XML language to define transformations for XML.

Description

Multiple vulnerabilities have been found in libxslt:

• Multiple errors exist in pattern.c and functions.c (CVE-2012-2870, CVE-2012-6139).
• A double-free error exists in templates.c (CVE-2012-2893).
• A NULL pointer dereference in keys.c (CVE-2012-6139).
• An error in handling stylesheets containing DTDs (CVE-2013-4520).

Impact

A remote attacker could entice a user to process a specially crafted file in an application linked against libxslt, possibly resulting in a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All libxslt users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=dev-libs/libxslt-1.1.28"

Packages which depend on this library may need to be recompiled. Tools such as revdep-rebuild may assist in identifying some of these packages.