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Microsoft NetMeeting memory corruption (Brief)

Classification:
===============
Level: [LOW]-med-high-crit
ID: HEXVIEW*2006*06*06*01
URL: http://www.hexview.com/docs/20060606-1.txt

Overview:
=========
Microsoft NetMeeting is an application that provides multipoint 
audio/video conferencing and supporting services (desktop sharing,
whiteboard, remote control, file transfer) for Microsoft Windows platform.

Affected products:
==================
All tests were performed using Microsoft NetMeeting 3.01
No other products were tested.

Vulnerability Summary:
======================
The application insufficiently validates received data opening a possibility
to overwrite portions of application memory causing exceptions ranging from
null-pointer access to a possible code execution. At the time of writing
there is no working exploit. HexView tests confirmed that it is possible to
remotely terminate an active NetMeeting presentation by either crashing the
hosting application or causing it to consume 100% of CPU resources.

Vendor Status:
==============
Microsoft was notified on June 4th, 2005 and is supposedly investigating
the issue. HexView will release more details about the vulnerability
in a separate disclosure.

About HexView:
==============
HexView contributes to online security-related lists for over a decade.
The scope of our expertise spreads over Windows, Linux, Sun, MacOS platforms,
network applications, and embedded devices. We also offer a variety of
consulting services. For more information visit http://www.hexview.com

Distribution:
=============
This document may be freely distributed through any channels as long as
the contents are kept unmodified. Commercial use of the information in
the document is not allowed without written permission from HexView
signed by our pgp key. Please direct all questions to vtalk@hexview.com

Feedback and comments:
======================
Feedback and questions about this disclosure are welcome at vtalk@hexview.com
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