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Microsoft Windows win32k.sys Driver Multiple Vulnerabilities

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Description


Multiple vulnerabilities have been reported in Microsoft Windows, which can be exploited by malicious, local users to gain escalated privileges.

1) A double-free error in the "win32k.sys" driver when handling PFE objects can be exploited to execute code in the kernel.

2) A second double-free error in the "win32k.sys" driver when running 16-bit programs can be exploited to execute code in the kernel.

3) A memory allocation error in the "win32k.sys" driver when copying data from user mode can be exploited to execute code in the kernel.

4) A logic error in the "win32k.sys" driver when linking driver object may lead to a corrupted linked list.

5) An input validation error in the "xxxRealDefWindowProc()" function (win32k.sys) when processing the WM_GETTEXT window message can be exploited to write a NULL byte to an arbitrary memory location.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
2-5) The vendor credits Tarjei Mandt, Norman.
5) Stéfan Le Berre, Sysdream.

Original Advisory:
MS10-098 (KB2436673):
http://www.microsoft.com/technet/security/bulletin/ms10-098.mspx

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 Multiple Vulnerabilities

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