Microsoft Security Bulletin (MS00-077)

[Microsoft Product Security <secnotif () MICROSOFT COM>]

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.
                    ********************************

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

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.

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

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.

Last Updated October 13, 2000
(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.

-----BEGIN PGP SIGNATURE-----
Version: PGP Personal Privacy 6.5.3

iQEVAwUBOeep040ZSRQxA/UrAQG88Qf/ZBvHORdQncm2zbpQh8nlUnopzsz0+Zhz
9FvihE/XV+5wJD4BxpOoLntqhNLixGQwNcaO9IZp+Wo7rW8xaAPu7p7lvFwiY1tg
VpZiGM5pJOUHcoDn33jWeuhf9eqT9PZwYNrPuCy1o0zkIseiSfTrz2cMUxE01acJ
Hx5whvzTMSRlSjjgnbHjaNuZssecA42qP3RkqVl6NtadfJHdpZsm5siOIEaDxZLg
HvpxrswBDHcqHTRTlWLhec8V/iGWAKGZvvBTfGozwEMpa9UJ/mu7uSFWIo5D6aD6
uQfpkHnPbHM1HRpNt5A4CpbitICNXVcq6GIcb7KK9A6hHL3K2XkVwA==
=/9Pe
-----END PGP SIGNATURE-----

   *******************************************************************
You have received  this e-mail bulletin as a result  of your registration
to  the   Microsoft  Product  Security  Notification   Service.  You  may
unsubscribe from this e-mail notification  service at any time by sending
an  e-mail  to  MICROSOFT_SECURITY-SIGNOFF-REQUEST () ANNOUNCE MICROSOFT COM
The subject line and message body are not used in processing the request,
and can be anything you like.

To verify the digital signature on this bulletin, please download our PGP
key at http://www.microsoft.com/technet/security/notify.asp.

For  more  information on  the  Microsoft  Security Notification  Service
please  visit  http://www.microsoft.com/technet/security/notify.asp.  For
security-related information  about Microsoft products, please  visit the
Microsoft Security Advisor web site at http://www.microsoft.com/security.