HyperTerminal Buffer Overflow Vulnerability
USSR Advisory Code: USSR-2000055
Public Disclosure Date:
October 18, 2000
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
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.
Microsoft Security Bulletin MS00-079: Frequently Asked Questions,
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
Windows 98 and 98SE:
Windows 2000: (can be applied to both Gold and Service Pack 1)
Underground Security Systems Research:
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
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
* Emergency Response Team
* 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
email@example.com for permission.
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.
If you have any questions, comments, concerns, updates, or suggestions
please feel free to send them to:
Underground Security Systems Research