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