Microsoft Security Bulletin (MS00-087)

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The following is a Security  Bulletin from the Microsoft Product Security
Notification Service.

Please do not  reply to this message,  as it was sent  from an unattended
mailbox.
                    ********************************

Microsoft Security Bulletin (MS00-087)
- --------------------------------------

Patch Available for "Terminal Server Login Buffer Overflow"
Vulnerability

Originally posted: November 08, 2000

Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Windows NT 4.0 Terminal Server. The
vulnerability could allow a malicious user to cause the Terminal
Server to fail or, in certain instances, to execute hostile code on
the server.


Frequently asked questions regarding this vulnerability and the patch
can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-087.asp

Issue
=====
An unchecked buffer in the Terminal Server login prompt could allow a
malicious user to cause the Terminal Server to execute arbitrary
code. The ability to execute arbitrary code would enable the
malicious user to add, change, or delete data, run code already on
the server, or upload new code to the server and run it. The
malicious user would not need to successfully login to the Terminal
Server in order to initiate this attack.

This vulnerability could be exploited remotely if connection requests
are not filtered. By default, Terminal Server listens on tcp port
3389. This port should be blocked at the firewall and/or router if
Terminal Server access from the Internet is not required.

Affected Software Versions
==========================
 - Microsoft Windows NT 4.0 Terminal Server

Patch Availability
==================
 - Microsoft Windows NT 4.0 Terminal Server:
   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=25565

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 MS00-087
   http://www.microsoft.com/technet/security/bulletin/fq00-087.asp
 - Microsoft Knowledge Base article Q277910 discusses this issue
   and will be available soon.
 - 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 Bruno Acselrad of CORE SDI (www.core-sdi.com) for
reporting this issue to us and working with us to protect customers.

Revisions
=========
November 08, 2000: Bulletin Created.

- ----------------------------------------------------------
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
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DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
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MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
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.

Last Updated November 08, 2000


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