Vulnerability in ISAPI Extension for Windows Media Services Could Cause Code Execution (822343)

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Title:      Vulnerability in ISAPI Extension for Windows Media
Services Could Cause Code Execution (822343)

Released:   June 25, 2003
Revised:    March 9, 2003 (version 2.0)
Software:   Windows Media Services
Impact:     Remote Code Execution
Max Risk:   Important 

Bulletin:   MS03-022

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS03-022.mspx
http://www.microsoft.com/security/security_bulletins/ms03-022.asp
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Reason for Revision:
====================
Subsequent to the release of this update Microsoft was made aware
that under certain circumstances the original update provided with
this bulletin did not replace the vulnerable file on the hard drive.
These situations involved whether or not Windows Media Services was
uninstalled previous to the application of the update. Microsoft has
addressed this issue and is re-releasing the update on Windows Update
and the Microsoft Download Center.

Issue:
======
Microsoft Windows Media Services is a feature of Microsoft Windows 
2000 Server, Advanced Server, and Datacenter Server and is also 
available in a downloadable version for Windows NT 4.0 Server. 
Windows Media Services contains support for a method of delivering 
media content to clients across a network known as multicast 
streaming. In multicast streaming, the server has no connection to 
or knowledge of the clients that may be receiving the stream of 
media content coming from the server. To facilitate logging of 
client information for the server, Windows 2000 includes a 
capability specifically designed to enable logging for multicast 
transmissions. 

This logging capability is implemented as an Internet Services 
Application Programming Interface (ISAPI) extension - nsiislog.dll. 
When Windows Media Services are added through add/remove programs to 
Windows 2000, nsiislog.dll is installed in the Internet Information 
Services (IIS) Scripts directory on the server.  Once Windows Media 
Services is installed, nsiislog.dll is automatically loaded and used 
by IIS.

A vulnerability exists because an attacker could send specially 
formed HTTP request (communications) to the server that could 
cause IIS to fail or execute code on the user's system. 

Windows Media Services is not installed by default on Windows 2000. 
An attacker attempting to exploit this vulnerability would have to 
be aware which computers on the network had Windows Media Services 
installed on it and send a specific request to that server.

Mitigating Factors:
====================
- - Windows Media Services 4.1 is not installed by default on Windows 
2000.
- - Windows Media Services are not available for Windows 2000 
Professional.
Risk Rating:
============
 - Important

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletins at
   http://www.microsoft.com/technet/security/bulletin/ms03-022.mspx
   http://www.microsoft.com/security/security_bulletins/ms03-022.asp
   for information on obtaining this patch.

Acknowledgment:
===============
- - Brett Moore (brett.moore () security-assessment com)

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