-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

HyperTerminal Buffer Overflow Vulnerability

USSR Advisory Code:  USSR-2000055

Public Disclosure Date:
October 18, 2000

Vendors Affected:

Microsoft Corporation
http://www.microsoft.com

Hilgraeve, Inc.
http://www.hilgraeve.com


Systems Affected:
HyperTerminal are installed by default on the following Microsoft
Operating Systems
Microsoft Windows 2000 (all versions)
Microsoft Windows Me
Microsoft Windows 98 and Windows 98SE


Problem:
The USSR Team has found a buffer overflow in the HyperTerminal telnet
client, which 
is in the code that processes the Telnet URL's, that can enable an
attacker to execute 
arbitrary code on another user's system. If a user opens an mail
containing HTML and 
also contains a malformed Telnet URL a buffer overrun will enable the
creator of the mail 
to cause arbitrary code to be runned on the user's system. 


Example: 

telnet://aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
:aaaa/

Status:  

More Information:

http://www.microsoft.com/technet/security/bulletin/ms00-079.asp

Microsoft Security Bulletin MS00-079: Frequently Asked Questions, 
http://www.microsoft.com/technet/security/bulletin/fq00-079.asp 

Microsoft Knowledge Base articles Q274548 (Win9x) and Q276471 (Win2K)
discuss this issue and will be available soon. 

A patch for HyperTerminal Private Edition (a for purchase upgrade
from 
the default client) is available from: http://www.hilgraeve.com


Fix: 
Windows 98 and 98SE:

http://download.microsoft.com/download/win98/Update/12395/W98/EN-US/27
4548USA8.EXE

Windows Me:

http://download.microsoft.com/download/winme/Update/12395/WinMe/EN-US/
274548USAM.EXE

Windows 2000: (can be applied to both Gold and Service Pack 1)

http://www.microsoft.com/downloads/release.asp?releaseid=25112


Related Links:

Underground Security Systems Research:
http://www.ussrback.com

CrunchSp Product:
http://www.crunchsp.com


About:

USSR is an emerging security company based in South America devoted 
to research about network security, vulnerability research, and
software
protection systems. One of the main objectives of USSR is to develop
and
implement new security and protection systems based on our knowledge
and
experience.

However, we believe that the way we implement security solutions,
can make a difference, CrunchSP is a good example.
In our day-to-day research we detect vulnerability issues in
different applications that we publish on our advisory board.

Most of USSR programmers and partners have more than 12 years
of experience in different computer based applications, with
great knowledge in high and low level programming languages.

For further information on USSR, feel free to contact us by email.

USSR has assembled some of the world's greatest software developers 
and security consultants to help us provide our customers this great 
range of security services:

* Network Penetration Testing
* Security Application development
* Application Security Testing and Certification
* Security Based on Security Tools
* Cryptography
* Emergency Response Team
* Firewalling
* Virtual Private Networking
* Intrusion Detection
* Support and maintenance

Copyright (c) 1999-2000 Underground Security Systems Research.
Permission is hereby granted for the redistribution of this alert
electronically. It is not to be edited in any way without explicit
consent of USSR. If you wish to reprint whole or any part of this
alert in any other medium excluding electronic medium, please e-mail
labs@ussrback.com for permission.

Disclaimer:
The information within this paper may change without notice. We may
not be held responsible for the use and/or potential effects of these
programs or advisories.  Use them and read them at your own risk or
not at all. You solely are responsible for this judgment. 

Feedback:

If you have any questions, comments, concerns, updates, or
suggestions
please feel free to send them to:

Underground Security Systems Research
mail:labs@ussrback.com
http://www.ussrback.com

-----BEGIN PGP SIGNATURE-----
Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com>

iQA/AwUBOe61QNybEYfHhkiVEQLnlQCgzt7rBAyC6Pxf7zWb/R+4aarWLgEAnjsd
Fp9XlUqr53MxIZS2m2U5AB+m
=v3g/
-----END PGP SIGNATURE-----