xorg security update

CentOS Errata and Security Advisory CESA-2011:0432

X.Org is an open source implementation of the X Window System. It provides
the basic low-level functionality that full-fledged graphical user
interfaces are designed upon.

A flaw was found in the X.Org X server resource database utility, xrdb.
Certain variables were not properly sanitized during the launch of a user’s
graphical session, which could possibly allow a remote attacker to execute
arbitrary code with root privileges, if they were able to make the display
manager execute xrdb with a specially-crafted X client hostname. For
example, by configuring the hostname on the target system via a crafted
DHCP reply, or by using the X Display Manager Control Protocol (XDMCP) to
connect to that system from a host that has a special DNS name.
(CVE-2011-0465)

Red Hat would like to thank Matthieu Herrb for reporting this issue.
Upstream acknowledges Sebastian Krahmer of the SuSE Security Team as the
original reporter.

Users of xorg-x11 should upgrade to these updated packages, which contain a
backported patch to resolve this issue. All running X.Org server instances
must be restarted for this update to take effect.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2011-April/079575.html

Affected packages:
xorg-x11
xorg-x11-Mesa-libGL
xorg-x11-Mesa-libGLU
xorg-x11-Xdmx
xorg-x11-Xnest
xorg-x11-Xvfb
xorg-x11-deprecated-libs
xorg-x11-deprecated-libs-devel
xorg-x11-devel
xorg-x11-doc
xorg-x11-font-utils
xorg-x11-libs
xorg-x11-sdk
xorg-x11-tools
xorg-x11-twm
xorg-x11-xauth
xorg-x11-xdm
xorg-x11-xfs

Upstream details at:
https://access.redhat.com/errata/RHSA-2011:0432