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ESB-2000.292 -- Microsoft Security Bulletin (MS00-077) -- Patch Available for "NetMeeting Desktop Sharing" Vulnerability

Date: 17 October 2000

Click here for printable version
Click here for PGP verifiable version
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              AUSCERT External Security Bulletin Redistribution
                             
           ESB-2000.292 -- Microsoft Security Bulletin (MS00-077)
       Patch Available for "NetMeeting Desktop Sharing" Vulnerability
                               17 October 2000

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

	AusCERT Security Bulletin Summary
	---------------------------------

Product:                NetMeeting
Vendor:                 Microsoft
Operating System:       Windows NT 4.0
                        Windows 2000
Impact:                 Denial of Service
Access Required:        Remote

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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.

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

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.

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This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.


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