MS10-043 - Vulnerability in Canonical Display Driver Could Allow Remote Code Execution (2032276)

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	Details
Vulnerability name/brief description	MS10-043 - Vulnerability in Canonical Display Driver Could Allow Remote Code Execution (2032276)
CVE/CAN name	CVE-2009-3678
Vendor threat level	Critical
SophosLabs threat level	Medium
Solution	MS10-043
Vendor description	This security update resolves a publicly disclosed vulnerability in the Canonical Display Driver (cdd.dll). Although it is possible that the vulnerability could allow code execution, successful code execution is unlikely due to memory randomization. In most scenarios, it is much more likely that an attacker who successfully exploited this vulnerability could cause the affected system to stop responding and automatically restart. This vulnerability depends on Windows Aero theme being enabled.
SophosLabs comments	This update corrects the way Windows parses data that has been copied from user mode to Kernel mode. An attack could occur when the user views a malicious image file that exploits this vulnerability with an application that uses APIs for GDI (Windows Graphical Device Interface). Because this vulnerability is mitigated by memory randomization and only occurs if the Windows Aero theme is enabled, SophosLabs have assigned this update a threat level of Medium but recommend users to apply this update at their earliest convenience.
SophosLabs testing result	N/A
Currently known exploits	At the time of writing SophosLabs have not observed any malware attempting to exploit this vulnerability. Should this situation change samples will be analyzed and we will take action as necessary.
First sample seen	N/A
Discovery date	July 13, 2010
Affected software	Windows 7 for x64 based Systems Windows Embedded Standard 7 for x64 based System Windows Server 2008 R2 for x64 based Systems
References	http://www.microsoft.com/technet/security/bulletin/MS10-043.mspx http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2009-3678
Credits	Microsoft MAPP
Revisions	July 13, 2010 - Initial analysis written

Explanation of terms

Vulnerability Name/Brief Description:
Vendor identifier plus a brief description of the type of attack.

CVE/CAN Name:
Currently assigned CVE name. If a CVE name doesn't exist the CAN name will be used until a CVE has been assigned.

Vendor Threat Level:
Threat level assigned by the vendor

SophosLabs Threat Level:
Threat level assigned by SophosLabs

• LOW RISK - There is little chance of this vulnerability being actively exploited by malware.
• MEDIUM RISK - There is a possibility of this vulnerability being actively exploited by malware.
• HIGH RISK - There is a strong possibility of this vulnerability being actively exploited by malware.
• CRITICAL RISK - This vulnerability will almost certainly be actively exploited by malware.

Solution:
Vendor-supplied Patch identifier and recommended solution, or workaround if applicable.

Vendor Description:
Summary of the cause and potential effect of the vulnerability provided by the vendor.

SophosLabs Comments:
SophosLabs' opinions and observations of the vulnerability in question.

SophosLabs Testing Result:
Details of completed lab testing, if applicable. Please note that the lab test environment may differ significantly from user environments.

Currently Known Exploits:
List of identities for known exploits, if applicable.

First Sample Seen:
Date of the first sample seen by SophosLabs.

Discovery Date:
Date of the earliest known publically disclosed advisory.

Affected Software:
Vulnerable platforms and software versions.