libvirt security update

CentOS Errata and Security Advisory CESA-2013:0127

The libvirt library is a C API for managing and interacting with the
virtualization capabilities of Linux and other operating systems. In
addition, libvirt provides tools for remote management of virtualized
systems.

Bus and device IDs were ignored when attempting to attach multiple USB
devices with identical vendor or product IDs to a guest. This could result
in the wrong device being attached to a guest, giving that guest root
access to the device. (CVE-2012-2693)

This update also fixes the following bugs:

• Previously, the libvirtd library failed to set the autostart flags for
  already defined QEMU domains. This bug has been fixed, and the domains can
  now be successfully marked as autostarted. (BZ#675319)

• Prior to this update, the virFileAbsPath() function was not taking into
  account the slash (“/”) directory separator when allocating memory for
  combining the cwd() function and a path. This behavior could lead to a
  memory corruption. With this update, a transformation to the virAsprintff()
  function has been introduced into virFileAbsPath(). As a result, the
  aforementioned behavior no longer occurs. (BZ#680289)

• With this update, a man page of the virsh user interface has been
  enhanced with information on the “domxml-from-native” and
  “domxml-to-native” commands. A correct notation of the format argument has
  been clarified. As a result, confusion is avoided when setting the format
  argument in the described commands. (BZ#783001)

All users of libvirt are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. After installing
the updated packages, libvirtd will be restarted automatically.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2013-January/081261.html
https://lists.centos.org/pipermail/centos-cr-announce/2013-January/026654.html

Affected packages:
libvirt
libvirt-devel
libvirt-python

Upstream details at:
https://access.redhat.com/errata/RHSA-2013:0127