Important: xorg-x11-server security update

Updated xorg-x11-server packages that fix several security issues are now
available for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

[Updated 18th January 2008]
The original packages distributed with this errata had a bug which could
cause some X applications to fail on 32-bit platforms. We have updated the
packages to correct this bug.

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

Two integer overflow flaws were found in the X.Org server's EVI and MIT-SHM
modules. 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-2007-6429)

A memory corruption flaw was found in the X.Org server's XInput extension.
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-2007-6427)

An input validation flaw was found in the X.Org server's XFree86-Misc
extension. 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-2007-5760)

An information disclosure flaw was found in the X.Org server's TOG-CUP
extension. A malicious authorized client could exploit this issue to cause
a denial of service (crash), or potentially view arbitrary memory content
within the X server's address space. (CVE-2007-6428)

A flaw was found in the X.Org server's XC-SECURITY extension, that could
have allowed a local user to verify the existence of an arbitrary file,
even in directories that are not normally accessible to that user.
(CVE-2007-5958)

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

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

391841 - CVE-2007-5958 Xorg / XFree86 file existence disclosure vulnerability
413721 - CVE-2007-6429 xorg / xfree86: integer overflow in EVI extension
413741 - CVE-2007-6429 xorg / xfree86: integer overflow in MIT-SHM extension
413791 - CVE-2007-6428 xorg / xfree86: information disclosure via TOG-CUP extension
413811 - CVE-2007-6427 xorg / xfree86: memory corruption via XInput extension
414031 - CVE-2007-5760 xorg: invalid array indexing in XFree86-Misc extension

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5760
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5958
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6427
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6428
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6429
http://www.redhat.com/security/updates/classification/#important