Microsoft Security Bulletin MS03-022: Flaw in ISAPI Extension for Windows Media Services Could Cause Code Execution (Q822343)

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Title:      Flaw in ISAPI Extension for Windows Media Services Could
            Cause Code Execution (822343)
Date:       25 June 2003
Software:   Microsoft(r) Windows(r) 2000
Impact:     Allow an attacker to execute code of their choice
Max Risk:   Important
Bulletin:   MS03-022

Microsoft encourages customers to review the Security Bulletins at: 
http://www.microsoft.com/technet/security/bulletin/MS03-022.asp
http://www.microsoft.com/security/security_bulletins/ms03-022.asp
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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.

There is a flaw in the way nsiislog.dll processes incoming client 
requests. 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.asp
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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