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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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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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