HyperTerminal Buffer Overflow Vulnerability

 
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://aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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/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


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.

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In our day-to-day research we detect vulnerability issues in
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Copyright (c) 1999-2000 Underground Security Systems Research.
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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. 

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