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HistoryNov 09, 2000 - 12:00 a.m.

Security Bulletin (MS00-087)

2000-11-0900:00:00
vulners.com
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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

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.

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.


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OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO
THE FOREGOING LIMITATION MAY NOT APPLY.

Last Updated November 08, 2000