libxslt security update

CentOS Errata and Security Advisory CESA-2012:1265

libxslt is a library for transforming XML files into other textual formats
(including HTML, plain text, and other XML representations of the
underlying data) using the standard XSLT stylesheet transformation
mechanism.

A heap-based buffer overflow flaw was found in the way libxslt applied
templates to nodes selected by certain namespaces. An attacker could use
this flaw to create a malicious XSL file that, when used by an application
linked against libxslt to perform an XSL transformation, could cause the
application to crash or, possibly, execute arbitrary code with the
privileges of the user running the application. (CVE-2012-2871)

Several denial of service flaws were found in libxslt. An attacker could
use these flaws to create a malicious XSL file that, when used by an
application linked against libxslt to perform an XSL transformation, could
cause the application to crash. (CVE-2012-2825, CVE-2012-2870,
CVE-2011-3970)

An information leak could occur if an application using libxslt processed
an untrusted XPath expression, or used a malicious XSL file to perform an
XSL transformation. If combined with other flaws, this leak could possibly
help an attacker bypass intended memory corruption protections.
(CVE-2011-1202)

All libxslt users are advised to upgrade to these updated packages, which
contain backported patches to resolve these issues. All running
applications linked against libxslt must be restarted for this update to
take effect.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2012-September/081033.html
https://lists.centos.org/pipermail/centos-announce/2012-September/081035.html

Affected packages:
libxslt
libxslt-devel
libxslt-python

Upstream details at:
https://access.redhat.com/errata/RHSA-2012:1265