From secnotif@MICROSOFT.COM Tue Aug 1 00:03:17 2000 From: Microsoft Product Security Resent-From: mea culpa To: MICROSOFT_SECURITY@ANNOUNCE.MICROSOFT.COM Resent-To: jericho@attrition.org Date: Mon, 24 Jul 2000 11:47:31 -0700 Subject: Microsoft Security Bulletin (MS00-050) 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. ******************************** -----BEGIN PGP SIGNED MESSAGE----- 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. 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 July 24, 2000 (c) 2000 Microsoft Corporation. All rights reserved. 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