Microsoft Windows Kernel "GetDCEx()" Memory Corruption Vulnerability

                                                "Microsoft Windows is the operating system developed by Microsoft. As of
May 2010, Windows was the most widely used system, with more than 90% of
the worldwide usage share of operating systems according to Net
Application."


II. DESCRIPTION
---------------------

VUPEN Vulnerability Research Team discovered a vulnerability affecting
Microsoft Windows.

The vulnerability is caused by a memory corruption within the kernel-mode
device driver "Win32k.sys" when handling Device Contexts (DC) via the
"GetDCEx()" function, which could be exploited by local attackers to gain
ring0 privileges via a specially crafted application.


III. AFFECTED PRODUCTS
---------------------------

Microsoft Windows Vista Service Pack 2
Microsoft Windows Vista Service Pack 1
Microsoft Windows Vista x64 Edition Service Pack 2
Microsoft Windows Vista x64 Edition Service Pack 1
Microsoft Windows XP Service Pack 3
Microsoft Windows XP Service Pack 2
Microsoft Windows XP Professional x64 Edition Service Pack 2
Microsoft Windows Server 2008 (32-bit) Service Pack 2
Microsoft Windows Server 2008 (32-bit)
Microsoft Windows Server 2008 (x64) Service Pack 2
Microsoft Windows Server 2008 (x64)
Microsoft Windows Server 2008 (Itanium) Service Pack 2
Microsoft Windows Server 2008 (Itanium)
Microsoft Windows Server 2003 Service Pack 2
Microsoft Windows Server 2003 SP2 (Itanium)
Microsoft Windows Server 2003 x64 Edition Service Pack 2
Microsoft Windows 2000 Service Pack 4


IV. Binary Analysis & Proof-of-concept
---------------------------------------

In-depth binary analysis of the vulnerability and a proof-of-concept
have been published by VUPEN through the VUPEN Binary Analysis & Exploits
portal :

http://www.vupen.com/exploits/


V. SOLUTION
----------------

Apply MS10-032 security update:
http://www.microsoft.com/technet/security/bulletin/ms10-032.mspx


VI. CREDIT
--------------

The vulnerability was discovered by Sebastien Renaud of VUPEN Security