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.

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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