Vulnerability: MS10-026 - Vulnerability in Microsoft DirectShow Could Allow Remote Code Execution (977816)

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	Details
Vulnerability name/brief description	Vulnerability in Microsoft DirectShow Could Allow Remote Code Execution (977816)
CVE/CAN name	CVE-2010-0480
Vendor threat level	Critical
SophosLabs threat level	Medium
Solution	MS10-026
Vendor description	This security update resolves a privately reported vulnerability in Microsoft MPEG Layer-3 audio codecs. The vulnerability could allow remote code execution if a user opened a specially crafted AVI file containing an MPEG Layer-3 audio stream. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system.
SophosLabs comments	Although the Layer-3 codecs are commonplace on most windows systems, of which most current versions are vulnerable, SophosLabs has not seen any samples of crafted AVI files which attempt to exploit this vulnerability resulting in a medium threat level.
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	13th April 2010
Affected software	Microsoft Windows 2000 Service Pack 4 MPEG Layer-3 codecs Windows XP Service Pack 2 and Windows XP Service Pack 3 MPEG Layer-3 codecs Windows XP Professional x64 Edition Service Pack 2 MPEG Layer-3 codecs Windows Server 2003 Service Pack 2 MPEG Layer-3 codecs Windows Server 2003 x64 Edition Service Pack 2 MPEG Layer-3 codecs Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2 MPEG Layer-3 codecs Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2 MPEG Layer-3 codecs Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2** MPEG Layer-3 codecs Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2** MPEG Layer-3 codecs **Server Core installation not affected.
References	http://www.microsoft.com/technet/security/bulletin/MS10-026.mspx http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0480
Credits	MAPP
Revisions	13th April 2010 - Initial advisory 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:
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Vendor Description:
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SophosLabs Comments:
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SophosLabs Testing Result:
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Currently Known Exploits:
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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.