spice security update

CentOS Errata and Security Advisory CESA-2010:0651

The Simple Protocol for Independent Computing Environments (SPICE) is a
remote display protocol used in Red Hat Enterprise Linux for viewing
virtualized guests running on the Kernel-based Virtual Machine (KVM)
hypervisor, or on Red Hat Enterprise Virtualization Hypervisor.

The spice-xpi package provides a plug-in that allows the SPICE client to
run from within Mozilla Firefox.

A race condition was found in the way the SPICE Firefox plug-in and the
SPICE client communicated. A local attacker could use this flaw to trick
the plug-in and the SPICE client into communicating over an
attacker-controlled socket, possibly gaining access to authentication
details, or resulting in a man-in-the-middle attack on the SPICE
connection. (CVE-2010-2792)

It was found that the SPICE Firefox plug-in used a predictable name for its
log file. A local attacker could use this flaw to conduct a symbolic link
attack, allowing them to overwrite arbitrary files accessible to the user
running Firefox. (CVE-2010-2794)

This update also fixes the following bugs:

• a bug prevented users of Red Hat Enterprise Linux 5.5, with all updates
  applied, from running the SPICE Firefox plug-in when using Firefox 3.6.4.
  With this update, the plug-in works correctly with Firefox 3.6.4 and the
  latest version in Red Hat Enterprise Linux 5.5, Firefox 3.6.7. (BZ#618244)

• unused code has been removed during source code refactoring. This also
  resolves a bug in the SPICE Firefox plug-in that caused it to close random
  file descriptors. (BZ#594006, BZ#619067)

Note: This update should be installed together with the RHSA-2010:0632
qspice-client update: https://rhn.redhat.com/errata/RHSA-2010-0632.html

Users of spice-xpi should upgrade to this updated package, which contains
backported patches to correct these issues. After installing the update,
Firefox must be restarted for the changes to take effect.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2010-August/079107.html
https://lists.centos.org/pipermail/centos-announce/2010-August/079108.html

Affected packages:
spice-xpi

Upstream details at:
https://access.redhat.com/errata/RHSA-2010:0651