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"Secunia provides tremendous value for their customers, end-users, and to other security vendors."

Read more: http://secunia.com/blog/117/


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

SECUNIA ADVISORY ID:
SA41029

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/41029/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=41029

RELEASE DATE:
2010-08-19

DISCUSS ADVISORY:
http://secunia.com/advisories/41029/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/41029/

ONLY AVAILABLE IN CUSTOMER AREA:
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 * Report Reliability
 * Secunia PoC
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https://ca.secunia.com/?page=viewadvisory&vuln_id=41029

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

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

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
This Advisory was delivered by Secunia as a free service to help
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