Vulnerability: MS10-025 - Vulnerability in Microsoft Windows Media Services Could Allow Remote Code Execution (980858)

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	Details
Vulnerability name/brief description	Vulnerability in Microsoft Windows Media Services Could Allow Remote Code Execution (980858)
CVE/CAN name	CVE-2010-0478
Vendor threat level	Critical
SophosLabs threat level	Medium
Solution	MS10-025
Vendor description	This security update resolves a privately reported vulnerability in Windows Media Services running on Microsoft Windows 2000 Server. The vulnerability could allow remote code execution if an attacker sent a specially crafted transport information packet to a Microsoft Windows 2000 Server system running Windows Media Services. Firewall best practices and standard default firewall configurations can help protect networks from attacks that originate from outside the enterprise perimeter. Best practices recommend that systems that are connected to the Internet have a minimal number of ports exposed. On Microsoft Windows 2000 Server, Windows Media Services is an optional component and is not installed by default.
SophosLabs comments	This vulnerability exists due to the way Windows Media Services (running on Microsoft Windows 2000 Server Service Pack 4 platform) handles transport info network packets. The vulnerable code manifests itself in the Windows Media Unicast Service application (nsum.exe). This file is used by Windows Media Services in the distribution and publishing of streaming media content. To exploit this vulnerability, an attacker would have to send a specially crafted transport-information-packet to a computer running Windows 2000 Server Service Pack 4 with the Windows Media Services enabled. As this vulnerability was reported privately, information as to how to exploit it was drastically reduced. Moreover, the default installed option for Windows Media Services is off. In addition, corporate networks typically install firewalls which will stop any remote attacks that came from outside the firewall. As a result, the impact due to exploitation of this vulnerability is mitigated and unlikely to be high.
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 Server Service Pack 4
References	http://www.microsoft.com/technet/security/bulletin/MS10-025.mspx http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0478
Credits	MAPP
Revisions	13th April 2010 - Initial analysis written

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Vulnerability Name/Brief Description:
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Vendor Threat Level:
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SophosLabs Threat Level:
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• 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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First Sample Seen:
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Discovery Date:
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Affected Software:
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