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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:
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