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Microsoft Security Bulletin (MS00-016)
From: secnotif () MICROSOFT COM (Microsoft Product Security)
Date: Fri, 17 Mar 2000 16:25:05 -0800


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
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                    ********************************

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Microsoft Security Bulletin (MS00-016)
- --------------------------------------

Patch Available for "Malformed Media License Request" Vulnerability

Originally Posted: March 17, 2000

Summary
=======
Microsoft has released a patch that eliminates a denial of service
vulnerability in Microsoft(r) Windows Media(tm) License  Manager. The
vulnerability could allow a malicious user to temporarily prevent the
license server from issuing further  licenses to customers for
protected digital content (music and video).

Frequently asked questions regarding this vulnerability can be found
at http://www.microsoft.com/technet/security/bulletin/fq00-016.asp.

Issue
=====
Windows Media License Manager is part of Windows Media Rights Manager,
a component of Windows Media Technologies that enables  content
providers to distribute copyrighted digital media in encrypted form.
When Windows Media Player opens protected  digital media, it contacts
the provider's server, presents the user's license request
information, and obtains a license that  allows it to play the media.
However, a specially-malformed license request can cause License
Manager to halt, thereby  preventing legitimate subscribers from
obtaining a license for the same or other content hosted at this site.

The vulnerability does not in any way compromise the protection
provided by the encryption or prevent offline playing of  content that
the user has already licensed. The server can be put back into normal
operation by restarting the License  Manager.

Affected Software Versions
==========================
 - Microsoft Windows Media Technologies 4.1 and 4.0.

Patch Availability
==================
 - http://www.microsoft.com/Downloads/Release.asp?ReleaseID=19171

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.
 - Microsoft Security Bulletin MS00-016: Frequently Asked Questions,
   http://www.microsoft.com/technet/security/bulletin/fq00-016.asp.
 - Microsoft Knowledge Base (KB) article Q257200,
   Windows Media Server Rights Manager May Stop Serving Licenses,
   http://www.microsoft.com/technet/support/kb.asp?ID=257200.
 - 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
Technical Support is available at
http://support.microsoft.com/support/contact/default.asp

Acknowledgments
===============
Microsoft thanks Ranjiv Sharma for reporting this issue to us and
working with us to protect customers.

Revisions
=========
 - March 17, 2000: Bulletin Created.

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

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