libxml2 - integer overflows

Jueri Aedla discovered several integer overflows in libxml, which could
lead to the execution of arbitrary code or denial of service.

For the stable distribution (squeeze), this problem has been fixed in
version 2.7.8.dfsg-2+squeeze5.

For the testing distribution (wheezy) and the unstable distribution (sid),
this problem has been fixed in version 2.8.0+dfsg1-5.

We recommend that you upgrade your libxml2 packages.