xerces-c - security update

Brandon Perry discovered that xerces-c, a validating XML parser library
for C++, fails to successfully parse a DTD that is deeply nested,
causing a stack overflow. A remote unauthenticated attacker can take
advantage of this flaw to cause a denial of service against applications
using the xerces-c library.

Additionally this update includes an enhancement to enable applications
to fully disable DTD processing through the use of an environment
variable (XERCES_DISABLE_DTD).

For Debian 7 Wheezy, these problems have been fixed in version
3.1.1-3+deb7u4.

We recommend that you upgrade your xerces-c packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;