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To improve our services to our customers, we have made a number of
additions to the Secunia Advisories and have started translating the
advisories to German.

The improvements will help our customers to get a better
understanding of how we reached our conclusions, how it was rated,
our thoughts on exploitation, attack vectors, and scenarios.

This includes:
* Reason for rating
* Extended description
* Extended solution
* Exploit code or links to exploit code
* Deep links

Read the full description:
http://corporate.secunia.com/products/48/?r=l

Contact Secunia Sales for more information:
http://corporate.secunia.com/how_to_buy/15/?r=l

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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

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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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