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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2001.251 -- Microsoft Security Bulletin MS00-077 (version 2.0)
Patch Available for "NetMeeting Desktop Sharing" Vulnerability
25 June 2001
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Netmeeting
Vendor: Microsoft
Operating System: Windows
Impact: Denial of Service
Access Required: Remote
Ref: ESB-200.292
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Title: Patch Available for "NetMeeting Desktop Sharing"
Vulnerability
Released: 13 October 2000
Revised: 21 June 2001 (version 2.0)
Software: Netmeeting
Impact: Denial of service
Bulletin: MS00-077
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS00-077.asp.
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Reason for Revision:
====================
A new variant of the originally reported vulnerability has been
found.
The patch has been updated to address both the original and new
variants.
Issue:
======
A remote denial of service vulnerability has been discovered in a
component of Microsoft(r) 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(r)
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.
Mitigating Factors:
====================
- NetMeeting is not enabled by default on either Windows 2000 or
Windows NT(r) 4.0.
- The vulnerability could not be used for any broader attack - that
is, it could not be used to compromise data within a Netmeeting
session
or usurp administrative control of a remote desktop session.
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
Security Bulletin
http://www.microsoft.com/technet/security/bulletin/ms00-077.asp
for information on obtaining this patch.
Acknowledgment:
===============
- Peter Grundl
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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.
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