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Home : Advisories : Patch Available for "Terminal Server Login Buffer Overflow"

Title: Patch Available for "Terminal Server Login Buffer Overflow"
Released by: MS
Date: 8th November 2000
Printable version: Click here
-----BEGIN PGP SIGNED MESSAGE-----

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

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                    ********************************



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

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,

CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF

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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