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TITLE:
XFree86 Pixmap Creation Integer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA16777

VERIFY ADVISORY:
http://secunia.com/advisories/16777/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
XFree86 4.5.x
http://secunia.com/product/4870/
XFree86 4.4.x
http://secunia.com/product/3510/
XFree86 4.3.x
http://secunia.com/product/1131/
XFree86 4.2.x
http://secunia.com/product/3011/
XFree86 4.1.x
http://secunia.com/product/3012/

DESCRIPTION:
Luke Hutchison has reported a vulnerability in XFree86, which
potentially can be exploited by malicious, local users to gain
escalated privileges.

The vulnerability is caused due to an integer overflow in the
allocation of pixmaps. This can be exploited to cause a heap based
buffer overflow by creating an overly large pixmap.

Successful exploitation may lead to execution of arbitrary code.

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Luke Hutchison

ORIGINAL ADVISORY:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=166859

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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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