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TITLE:
Microsoft Windows win32k.sys Driver Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA46405

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46405/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46405

RELEASE DATE:
2011-10-11

DISCUSS ADVISORY:
http://secunia.com/advisories/46405/#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/46405/

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

https://ca.secunia.com/?page=viewadvisory&vuln_id=46405

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 gain escalated
privileges and by malicious people to cause a DoS (Denial of Service)
and compromise a user's system.

1) A NULL-pointer dereference error in the win32k.sys driver can be
exploited to execute arbitrary code in kernel mode.

2) An error in the win32k.sys driver when performing type translation
can be exploited to cause a system hang via a specially crafted
TrueType font file.

3) An error in the win32k.sys driver when handling certain font files
can be exploited to cause a buffer overflow via a specially crafted
".fon" font file.

4) A use-after-free error in the win32k.sys driver when handling
certain driver objects can be exploited to execute arbitrary code in
kernel mode.

Successful exploitation of vulnerabilities #1, #3, and #4 allows
execution of arbitrary code.

SOLUTION:
Apply patches.

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

PROVIDED AND/OR DISCOVERED BY:
4) Reported by the vendor.

The vendor also credits the following people:
1) Andrei Lutas, BitDefender and Tarjei Mandt, Norman.
2) Maik Wellmann.
3) Will Dorman, CERT/CC.

ORIGINAL ADVISORY:
MS11-077 (KB2567053):
http://technet.microsoft.com/en-us/security/bulletin/ms11-077

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:
http://secunia.com/vulnerability_intelligence/

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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Please Note:
Secunia recommends that you verify all advisories you receive by
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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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