Debian: DSA-3038-1 Critical: Libvirt Denial of Service Issues

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.

F...