(RHSA-2008:0503) Important: xorg-x11 security update

The xorg-x11 packages contain X.Org, 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 input validation flaw was discovered in X.org’s Security and Record
extensions. A malicious authorized client could exploit this issue to cause
a denial of service (crash) or, potentially, execute arbitrary code with
root privileges on the X.Org server. (CVE-2008-1377)

Multiple integer overflow flaws were found in X.org’s Render extension. A
malicious authorized client could exploit these issues to cause a denial of
service (crash) or, potentially, execute arbitrary code with root
privileges on the X.Org server. (CVE-2008-2360, CVE-2008-2361)

An input validation flaw was discovered in X.org’s MIT-SHM extension. A
client connected to the X.org server could read arbitrary server memory.
This could result in the sensitive data of other users of the X.org server
being disclosed. (CVE-2008-1379)

Users of xorg-x11 should upgrade to these updated packages, which contain
backported patches to resolve these issues.