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Microsoft Security Bulletin (MS00-077)

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



Patch Available for "NetMeeting Desktop Sharing" Vulnerability

Originally posted: October 13, 2000



Summary

=======

Microsoft has released a patch that eliminates a security

vulnerability in NetMeeting, an application that ships with

Microsoft(r) Windows 2000 and is also available as a separate

download for Windows NT 4.0. The vulnerability could allow a

malicious user to temporarily prevent an affected machine from

providing any NetMeeting services and possibly consume 100% CPU

utilization during an attack.



Frequently asked questions regarding this vulnerability and the patch

can be found at

http://www.microsoft.com/technet/security/bulletin/fq00-077.asp



Issue

=====

A remote denial of service vulnerability has been discovered in a

component of NetMeeting. The denial of service can occur when a

malicious client sends a particular malformed string to a port which

the NetMeeting service is listening on and with Remote Desktop

Sharing enabled.



Although the NetMeeting application is provided as part of Windows

2000 products, the application and affected component is not enabled

by default, and customers who have not enabled it would not be at

risk from this vulnerability.



Affected Software Versions

==========================

NetMeeting Version 3.01 (4.4.3385) on Windows 2000 or Windows NT 4.0.



Patch Availability

==================

 - Windows 2000 and Windows NT 4.0:

   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=25029



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 MS00-077,

   http://www.microsoft.com/technet/security/bulletin/fq00-077.asp

 - Microsoft Knowledge Base article Q273854 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 Kirk Corey of Diversified Software Industries, Inc.

(www.dsi-inc.net) for reporting this issue to us and working with us

to protect customers.



Revisions

=========

 - October 13, 2000: Bulletin Created.



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



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"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

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DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,

CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF

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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.



Last Updated October 13, 2000

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



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