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TITLE:
Microsoft Windows win32k.sys Driver Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA45186

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/45186/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=45186

RELEASE DATE:
2011-07-12

DISCUSS ADVISORY:
http://secunia.com/advisories/45186/#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/45186/

ONLY AVAILABLE IN CUSTOMER AREA:
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 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=45186

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

1) Nine use-after-free errors in the Win32k kernel-mode driver
(win32k.sys) when handling kernel-mode driver objects can be
exploited to dereference already freed memory.

Successful exploitation allows execution of arbitrary code with
kernel-mode privileges.

2) Five NULL pointer dereference errors exist in the Win32k
kernel-mode driver (win32k.sys) when handling pointers to certain
kernel-mode driver objects.

Successful exploitation allows execution of arbitrary code with
kernel-mode privileges.

3) An error in the Win32k kernel-mode driver (win32k.sys) when
validating function parameters can be exploited to disclose data from
any kernel-mode memory location.

SOLUTION:
Apply patches.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
1, 2) The vendor credits Tarjei Mandt, Norman.
3) The vendor credits Mr. Liang Yin, Prof. Sihan Qing and Weiping
Wen, and Mr. Husheng Zhou, Department of Information Security,
Beijing University.

ORIGINAL ADVISORY:
MS11-054 (KB2555917):
http://www.microsoft.com/technet/security/Bulletin/MS11-054.mspx

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
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EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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