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Microsoft Security Bulletin (MS00-079)

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Patch Available for "HyperTerminal Buffer Overflow" Vulnerability

Originally posted: October 18, 2000



Summary

=======

Microsoft has released a patch that eliminates a security

vulnerability in the HyperTerminal application that ships with

several Microsoft(r) operating systems. This vulnerability could,

under certain circumstances, allow a malicious user to execute

arbitrary code on another user's system.



Frequently asked questions regarding this vulnerability and the patch

can be found at

http://www.microsoft.com/technet/security/bulletin/fq00-079.asp



Issue

=====

The HyperTerminal application is a utility that installs, by default,

on all versions of Windows 98, 98SE, Windows ME, Windows NT, and

Windows 2000. The product contains an unchecked buffer in a section

of the code that processes Telnet URLs. If a user opened an HTML mail

that contained a particularly malformed Telnet URL, it would result

in a buffer overrun that could enable the creator of the mail to

cause arbitrary code to run on the user's system. Please note that,

although a Telnet URL is involved in this vulnerability, there is no

relationship between this vulnerability and the "Windows 2000 Telnet

Client NTLM Authentication" vulnerability discussed in MS00-067.



HyperTerminal is the default Telnet client on Windows 98, 98SE and

ME. However, it is not the default Telnet client on Windows 2000, and

Windows 2000 users who have not taken steps to make it the default

Telnet client would not be affected by the vulnerability.



Although HyperTerminal ships as part of several Microsoft products,

it was developed by a third party - Hilgraeve, Inc. Additional

information on the vulnerability and a patch for their full version

product, HyperTerminal Private Edition, is available from their web

site at

http://www.hilgraeve.com



Affected Software Versions

==========================

 - Microsoft Windows 98 and Windows 98SE

 - Microsoft Windows Me

 - Microsoft Windows 2000



Patch Availability

==================

 - Windows 98 and 98SE:

   http://download.microsoft.com/download/win98/Update/12395/W98

   /EN-US/274548USA8.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



Note: The above URLs may have been wrapped for readability.



Note: Additional security patches are available at the Microsoft

Download Center



More Information

================

Please see the following references for more information related to

this issue.



 - Frequently Asked Questions: Microsoft Security Bulletin MS00-079,

   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

 - Microsoft TechNet Security web site,

   http://www.microsoft.com/technet/security/default.asp



Obtaining Support on this Issue

===============================

This is a fully supported patch. Information on contacting Microsoft

Product Support Services is available at

http://support.microsoft.com/support/contact/default.asp.





Acknowledgments

===============

Microsoft thanks  Luciano Martins of USSR Labs (www.ussrback.com) for

reporting this issue to us and working with us to protect customers.



Revisions

=========

October 18, 2000: Bulletin Created.



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