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Home » Security Advisories» Microsoft » Vulnerability in ISAPI Extension for Windows Media Services Could Cause Code Execution (822343)

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

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.

  • Vendor: Microsoft
  • Vendor ID:
  • Date: March 09, 2004


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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.mooresecurity-assessment.com)

********************************************************************
Protect your PC: Microsoft has provided information on how you
can help protect your PC at the following locations:
http://www.microsoft.com/security/protect/

If you receive an e-mail that claims to be distributing a
Microsoft security patch, it is a hoax that may be distributing a
virus. Microsoft does not distribute security patches via e-mail.
You can learn more about Microsoft's software distribution
policies here:
http://www.microsoft.com/technet/security/topics/policy/swdist.mspx
********************************************************************
- --------------------------------------------------------------------
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT
DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING
THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE
LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT,
INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL
DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY
FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING
LIMITATION MAY NOT APPLY.
- --------------------------------------------------------------------

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