[SA22668] Microsoft Windows GDI Kernel Structures Handling Vulnerability

TITLE:
Microsoft Windows GDI Kernel Structures Handling Vulnerability

SECUNIA ADVISORY ID:
SA22668

VERIFY ADVISORY:
http://secunia.com/advisories/22668/

CRITICAL:
Less critical

IMPACT:
Privilege escalation, DoS

WHERE:
Local system

OPERATING SYSTEM:
Microsoft Windows 2000 Advanced Server
http://secunia.com/product/21/
Microsoft Windows 2000 Datacenter Server
http://secunia.com/product/1177/
Microsoft Windows 2000 Professional
http://secunia.com/product/1/
Microsoft Windows 2000 Server
http://secunia.com/product/20/
Microsoft Windows XP Home Edition
http://secunia.com/product/16/
Microsoft Windows XP Professional
http://secunia.com/product/22/

DESCRIPTION:
Cesar Cerrudo has reported a vulnerability in Microsoft Windows,
which can be exploited by malicious, local users to cause a DoS
(Denial of Service) and potentially gain escalated privileges.

The vulnerability is caused due to an error within the handling of
GDI kernel structures allowing the created global shared memory
section, which is mapped with read-only permissions, to be re-mapped
with read-write permissions. This can be exploited to corrupt memory
by overwriting the data structures with arbitrary data.

The vulnerability is reported in Windows 2000 and Windows XP.
Microsoft Windows 2003 Server is reportedly not affected.

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Cesar Cerrudo, Argeniss.

ORIGINAL ADVISORY:
http://projects.info-pull.com/mokb/MOKB-06-11-2006.html

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

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http://secunia.com/about_secunia_advisories/

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