libvirt - security update

Several vulnerabilities were discovered in Libvirt, a virtualisation
abstraction library. The Common Vulnerabilities and Exposures project
identifies the following problems:

• CVE-2014-0179
  Richard Jones and Daniel P. Berrange found that libvirt passes the
  XML_PARSE_NOENT flag when parsing XML documents using the libxml2
  library, in which case all XML entities in the parsed documents are
  expanded. A user able to force libvirtd to parse an XML document
  with an entity pointing to a special file that blocks on read access
  could use this flaw to cause libvirtd to hang indefinitely,
  resulting in a denial of service on the system.
• CVE-2014-3633
  Luyao Huang of Red Hat found that the qemu implementation of
  virDomainGetBlockIoTune computed an index into the array of disks
  for the live definition, then used it as the index into the array of
  disks for the persistent definition, which could result into an
  out-of-bounds read access in qemuDomainGetBlockIoTune().

A remote attacker able to establish a read-only connection to
libvirtd could use this flaw to crash libvirtd or, potentially, leak
memory from the libvirtd process.

For the stable distribution (wheezy), these problems have been fixed in
version 0.9.12.3-1+deb7u1.

For the unstable distribution (sid), these problems have been fixed in
version 1.2.8-2.

We recommend that you upgrade your libvirt packages.