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.

Changelog
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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

Other references
Further details available to Secunia VIM customers

Deep Links
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