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Microsoft Windows win32k.sys Driver Denial of Service and Privilege Escalation

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Description


Some vulnerabilities have been reported in Microsoft Windows, which can be exploited by malicious, local users to cause a DoS (Denial of Service) or gain escalated privileges.

1) Improper validation of the "hbmpItem" member of the MENUITEMINFO structure in the "xxxRealDrawMenuItem()" function in win32k.sys can be exploited to cause a vulnerable system to become unresponsive and restart.

2) An error within the "SfnLOGONNOTIFY()" function in win32k.sys when handling window messages can be exploited to cause a kernel crash or potentially execute arbitrary code in kernel mode by sending a specially crafted 4Ch message to the "DDEMLEvent" window.

3) Memory is not properly allocated by win32k.sys when copying data from user mode, which can be exploited to cause a pool overflow and execute arbitrary code in kernel-mode.

4) Improper validation of input passed from user mode in win32k.sys can be exploited to execute arbitrary code in kernel-mode.

5) Pseudo handles in callback parameters when creating a new window are not properly validated by win32k.sys, which can be exploited to execute arbitrary code in kernel-mode.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Der Hersteller nennt Tavis Ormandy, Google.
2) Reported as a DoS by MJ0011. Additional information provided by the vendor.
3,4) The vendor credits Matthieu Suiche, MoonSols.
5) Nicolas Economou, Core Security Technologies.

Original Advisory:
MS10-048 (KB2160329):
http://www.microsoft.com/technet/security/Bulletin/MS10-048.mspx

Core Security Technologies:
http://www.coresecurity.com/content/microsoft-windows-createwindow-function-callback-bug

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Windows win32k.sys Driver Denial of Service and Privilege Escalation

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