HyperTerminal Buffer Overflow Vulnerability

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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.

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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
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[email protected] 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:[email protected]
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