Synopsis:          Moderate: libvirt security and bug fix update
Advisory ID:       SLSA-2014:0560-1
Issue Date:        2014-05-27
CVE Numbers:       CVE-2014-0179
--

It was 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-2014-0179)

This update also fixes the following bugs:

* When hot unplugging a virtual CPU (vCPU), libvirt kept a pointer to
already freed memory if the vCPU was pinned to a host CPU. Consequently,
when reading the CPU pinning information, libvirt terminated unexpectedly
due to an attempt to access this memory. This update ensures that libvirt
releases the pointer to the previously allocated memory when a vCPU is
being hot unplugged, and it no longer crashes in this situation.

* Previously, libvirt passed an incorrect argument to the "tc" command
when setting quality of service (QoS) on a network interface controller
(NIC). As a consequence, QoS was applied only to IP traffic. With this
update, libvirt constructs the "tc" command correctly so that QoS is
applied to all traffic as expected.

* When using the sanlock daemon for managing access to shared storage,
libvirt expected all QEMU domains to be registered with sanlock. However,
if a QEMU domain was started prior to enabling sanlock, the domain was not
registered with sanlock. Consequently, migration of a virtual machine (VM)
from such a QEMU domain failed with a libvirt error. With this update,
libvirt verifies whether a QEMU domain process is registered with sanlock
before it starts working with the domain, ensuring that migration of
virtual machines works as expected.

After installing the updated packages, libvirtd will be restarted
automatically.
--

SL6
  x86_64
    libvirt-0.10.2-29.el6_5.8.x86_64.rpm
    libvirt-client-0.10.2-29.el6_5.8.i686.rpm
    libvirt-client-0.10.2-29.el6_5.8.x86_64.rpm
    libvirt-debuginfo-0.10.2-29.el6_5.8.i686.rpm
    libvirt-debuginfo-0.10.2-29.el6_5.8.x86_64.rpm
    libvirt-python-0.10.2-29.el6_5.8.x86_64.rpm
    libvirt-devel-0.10.2-29.el6_5.8.i686.rpm
    libvirt-devel-0.10.2-29.el6_5.8.x86_64.rpm
    libvirt-lock-sanlock-0.10.2-29.el6_5.8.x86_64.rpm
  i386
    libvirt-0.10.2-29.el6_5.8.i686.rpm
    libvirt-client-0.10.2-29.el6_5.8.i686.rpm
    libvirt-debuginfo-0.10.2-29.el6_5.8.i686.rpm
    libvirt-python-0.10.2-29.el6_5.8.i686.rpm
    libvirt-devel-0.10.2-29.el6_5.8.i686.rpm

- Scientific Linux Development Team