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Microsoft Security Bulletin (MS00-050)

- --------------------------------------

Patch Available for "Telnet Server Flooding" Vulnerability

Originally Posted: July 24, 2000



Summary

=======

Microsoft has released a patch that eliminates a security

vulnerability in the Telnet Server that ships as part of Microsoft(r)

Windows 2000. The vulnerability could allow a malicious user to

prevent an affected machine from providing Telnet services.



Frequently asked questions regarding this vulnerability and the patch

can be found at

http://www.microsoft.com/technet/security/bulletin/fq00-050.asp



Issue

======

A remote denial of service vulnerability has been discovered in the

Telnet Server that ships with Microsoft Windows 2000. The denial of

service can occur when a malicious client sends a particular

malformed string to the server.

Although the Telnet service is provided as part of Windows 2000

products, the service is not enabled by default, and customers who

have not enabled it would not be at risk. Even in affected systems,

the effect of the vulnerability is limited to Telnet itself - there

is no capability to cause other services to fail, or to cause Windows

2000 to fail.



Telnet services could be restored after an attack by restarting the

Telnet Server.



Affected Software Versions

==========================

 - Microsoft Windows 2000 Professional

 - Microsoft Windows 2000 Server

 - Microsoft Windows 2000 Advanced Server



Patch Availability

==================

 - Microsoft Windows 2000 All Versions:

   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=22753



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 MS00-050,

   http://www.microsoft.com/technet/security/bulletin/fq00-050.asp

 - Microsoft Knowledge Base (KB) article, Q267843 discusses this

   issue.

 - 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.



Revisions

=========

 - July 24, 2000: Bulletin Created.



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"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 July 24, 2000

(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.



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