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Insecure Library Loading
Not critical

Microsoft Windows win32k.sys Driver "GreStretchBltInternal()" Vulnerability

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Release Date:  2010-08-18    Views:  5,498

Secunia Advisory SA41029

Where:

Local system

Impact:

DoS

Solution Status:

Unpatched

Operating System:

CVE Reference(s):

No CVE references.

Description


Tavis Ormandy has discovered a vulnerability in Microsoft Windows, which can be exploited by malicious, local users to cause a Denial of Service (DoS).

The vulnerability is caused due to a logic error in the "GreStretchBltInternal()" function in win32k.sys when the same hdcDest and hdcSrc Device Context (DC) handles are passed as arguments to the "BitBlt()" API. This can be exploited to unmap the same object twice, triggering an unhandled exception in the kernel that crashes the system.

The vulnerability is confirmed in a fully patched version of Windows 7 Professional. No other supported versions of Windows currently seem affected.


Solution:
Grant access to trusted users only.

Provided and/or discovered by:
Tavis Ormandy

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 "GreStretchBltInternal()" Vulnerability

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