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TITLE:
X.org X11 Composite Pixmap Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA26743

VERIFY ADVISORY:
http://secunia.com/advisories/26743/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
X Window System 11 (X11) 7.x
http://secunia.com/product/8806/

DESCRIPTION:
A vulnerability has been reported in X.org X11, which potentially can
be exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to a boundary error within the
composite extension when copying data from pixmaps with different bit
depths. This can be exploited to cause a buffer overflow by copying
data between specially crafted pixmaps.

The vulnerability is reported in xorg-server prior to version 1.4.
Other versions may also be affected.

SOLUTION:
Update to xorg-server 1.4.

PROVIDED AND/OR DISCOVERED BY:
Reported in a bug by Aaron Plattner.

ORIGINAL ADVISORY:
http://lists.freedesktop.org/archives/xorg-announce/2007-September/000378.html
http://bugs.freedesktop.org/show_bug.cgi?id=7447

OTHER REFERENCES:
http://lists.debian.org/debian-security-announce/debian-security-announce-2007/msg00134.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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