libxml2 security update

CentOS Errata and Security Advisory CESA-2008:0884

The libxml2 packages provide a library that allows you to manipulate XML
files. It includes support to read, modify, and write XML and HTML files.

A heap-based buffer overflow flaw was found in the way libxml2 handled long
XML entity names. If an application linked against libxml2 processed
untrusted malformed XML content, it could cause the application to crash
or, possibly, execute arbitrary code. (CVE-2008-3529)

All users of libxml2 are advised to upgrade to these updated packages,
which contain a backported patch to resolve this issue.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2008-September/077396.html
https://lists.centos.org/pipermail/centos-announce/2008-September/077397.html
https://lists.centos.org/pipermail/centos-announce/2008-September/077399.html
https://lists.centos.org/pipermail/centos-announce/2008-September/077400.html
https://lists.centos.org/pipermail/centos-announce/2008-September/077401.html
https://lists.centos.org/pipermail/centos-announce/2008-September/077402.html
https://lists.centos.org/pipermail/centos-announce/2008-September/077410.html
https://lists.centos.org/pipermail/centos-announce/2008-September/077411.html

Affected packages:
libxml2
libxml2-devel
libxml2-python

Upstream details at:
https://access.redhat.com/errata/RHSA-2008:0884