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TITLE:
X11 "_XKB_CHARSET" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA21845

VERIFY ADVISORY:
http://secunia.com/advisories/21845/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
X Window System 11 (X11) 6.x
http://secunia.com/product/3913/

DESCRIPTION:
RISE Security has reported a vulnerability in libX11, which can be
exploited by malicious, local users to gain escalated privileges.

The vulnerability is due to a boundary error in libX11. This can be
exploited to cause a buffer overflow via the "_XKB_CHARSET"
environment variable when "DISPLAY" is set to a X Window System
server with the XKEYBOARD extension enabled.

Successful exploitation allows arbitrary code execution with the
privileges of the application dynamically linked to the library.

The vulnerability has been reported in version X11R6.4. Other
versions may also be affected.

SOLUTION:
Update to version X11R6.5.1 or later.

PROVIDED AND/OR DISCOVERED BY:
Adriano Lima and Filipe Balestra

ORIGINAL ADVISORY:
http://www.risesecurity.org/advisory/RISE-2006001.txt

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