Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2000.300 -- Microsoft Security Bulletin (MS00-079)
Patch Available for "HyperTerminal Buffer Overflow" Vulnerability
20 October 2000
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AusCERT Security Bulletin Summary
---------------------------------
Product: HyperTerminal
Vendor: Microsoft
Operating System: Windows 98
Windows 98SE
Windows Me
Windows 2000
Impact: Execute Arbitrary Code/Commands
Access Required: Remote
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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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- - ----------------------------------------------------------------------
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED
"AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL
WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY
DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
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POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO
THE FOREGOING LIMITATION MAY NOT APPLY.
(c) 2000 Microsoft Corporation. All rights reserved. Terms of Use
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