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From:MICROSOFT <secure_(at)_microsoft.com>
Date:31.05.2003
Subject:Microsoft Security Bulletin MS03-019: Flaw in ISAPI Extension for Windows Media Services Could Cause Code Execution (817772)

-----BEGIN PGP SIGNED MESSAGE-----

- -------------------------------------------------------------------
Title:      Flaw in ISAPI Extension for Windows Media Services   
           Could Cause Code Execution (817772)
Date:       28 May 2003
Software:   Microsoft(r) Windows NT(r) 4.0, and Windows(r) 2000
Impact:     Allow an attacker to execute code of their choice
Max Risk:   Important
Bulletin:   MS03-019

Microsoft encourages customers to review the Security Bulletins at:
http://www.microsoft.com/technet/security/bulletin/MS03-019.asp
http://www.microsoft.com/security/security_bulletins/ms03-019.asp
- -------------------------------------------------------------------

Reason for Revision:
====================

On May 28th, Microsoft released the initial version of this
bulletin, rating the severity of the vulnerability as Moderate.
Subsequent to that release we have determined that the actions an
attacker could take as a result of exploiting this vulnerability
could include the ability to execute arbitrary code. As a result
Microsoft has reissued this bulletin and changed the severity
rating to Important. The original corrects the vulnerability and is
not being re-released.

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

This capability is implemented as an Internet Services Application
Programming Interface (ISAPI) extension - nsiislog.dll. When
Windows Media Services are installed in Windows NT 4.0 Server or
added through add/remove programs to Windows 2000, nsiislog.dll is
installed to the Internet Information Services (IIS) Scripts
directory on the server.

There is a flaw in the way in which nsiislog.dll processes incoming
requests. A vulnerability exists because an attacker could send
specially formed 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,
and must be downloaded to install on Windows NT 4.0. 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, and must be downloaded to install on Windows NT 4.0.
- Windows Media Services are not available for Windows 2000
Professional or Windows NT 4.0 Workstation
- The attacker would have to know which server on the network
Windows Media Services had been installed on.  

Risk Rating:
============
Moderate

Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
  Security Bulletins at
  
http://www.microsoft.com/technet/security/bulletin/ms03-019.asp
http://www.microsoft.com/security/security_bulletins/ms03-019.asp
  
  for information on obtaining this patch.

Acknowledgment:
===============
- Brett Moore ([email protected])

- -------------------------------------------------------------------

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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