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Microsoft Security Bulletin (MS00-064)
From: Microsoft Product Security <secnotif () MICROSOFT COM>
Date: Wed, 6 Sep 2000 18:04:45 -0700

The following is a Security  Bulletin from the Microsoft Product Security
Notification Service.

Please do not  reply to this message,  as it was sent  from an unattended
mailbox.
                    ********************************

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Microsoft Security Bulletin (MS00-064)
- ---------------------------------------

Patch Available for "Unicast Service Race Condition" Vulnerability
Originally posted: September 06, 2000

Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability  in Microsoft(r) Windows Media(tm) Services. The
vulnerability could allow  a malicious user to prevent an affected
server from providing useful  service.

Frequently asked questions regarding this vulnerability and the patch
can  be found at
http://www.microsoft.com/technet/security/bulletin/fq00-064.asp

Issue
======
If a client sends a particular type of malformed request to a Windows
Media server, it could induce a race condition. Once the server has
been  put into such a state, subsequent requests - even ones that
would  normally be legitimate - could cause the Windows Media Unicast
Service to  fail. If this happened, any ongoing sessions would be
lost, and the  server would stop providing unicast streaming media
services.

An affected server could be put back into service by restarting the
Unicast Service. The vulnerability would not cause any data loss, nor
would it enable the malicious user to usurp any administrative
privileges  on the machine.

Affected Software Versions
==========================
 - Microsoft Windows Media Services 4.0
 - Microsoft Windows Media Services 4.1

Patch Availability
==================
 - Microsoft Windows Media Services 4.1:
   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24167

Note: Customers using Windows Media Services 4.0 should upgrade to
Windows Media Services 4.1 and then apply the above patch.

Note: Additional security patches are available at the Microsoft
Download  Center

More Information
================
Please see the following references for more information related to
this  issue.

 - Frequently Asked Questions: Microsoft Security Bulletin MS00-064,
   http://www.microsoft.com/technet/security/bulletin/fq00-064.asp
 - Microsoft Knowledge Base article Q273014 discusses this issue
   and will be available soon.
 - Microsoft TechNet Security web site,
   http://www.microsoft.com/technet/security/default.asp

Obtaining Support on this Issue
===============================
This is a fully supported patch. Information on contacting Microsoft
Product Support Services is available at
http://support.microsoft.com/support/contact/default.asp.

Acknowledgments
===============
Microsoft thanks  Kit Knox of NaviSite (www.navisite.com) for
reporting  this issue to us and working with us to protect customers.

Revisions
=========
September 06, 2000: Bulletin Created.

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

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.

(c) 2000 Microsoft Corporation. All rights reserved. Terms of Use

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