libX11, xorg security update

CentOS Errata and Security Advisory CESA-2007:0157

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.

An integer overflow flaw was found in the X.org XGetPixel() function.
Improper use of this function could cause an application calling it to
function improperly, possibly leading to a crash or arbitrary code
execution. (CVE-2007-1667)

Users of the X.org X11 server should upgrade to these updated packages,
which contain a backported patch and are not vulnerable to this issue.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2007-April/075854.html
https://lists.centos.org/pipermail/centos-announce/2007-April/075855.html

Affected packages:
libX11
libX11-devel
xorg-x11-apps

Upstream details at:
https://access.redhat.com/errata/RHSA-2007:0157