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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.246 -- Microsoft Security Bulletin (MS00-066) Patch Available for "Malformed RPC Packet" Vulnerability 12 September 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Windows 2000 Vendor: Microsoft Operating System: Windows 2000 Platform: N/A Impact: Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-066) ====================================== Patch Available for "Malformed RPC Packet" Vulnerability Originally posted: September 11, 2000 Summary ======= Microsoft has released a patch that eliminates a security vulnerability in Microsoft(r) Windows 2000. The vulnerability could allow a malicious user to cause a Denial of Service on a Windows 2000 computer. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-066.asp Issue ===== A remote denial of service vulnerability has been discovered in Microsoft Windows 2000 Server. The denial of service can occur when a malicious client sends a particular malformed RPC (Remote Procedure Call) packet to the server, causing the RPC service to fail. Windows 2000 servers that are directly exposed to the Internet are at greatest risk from this vulnerability. A server behind a firewall that blocks ports 135-139 and 445 will not be affected by this vulnerability from the Internet. RPC services and the functioning of the server could be restored after an attack by rebooting the affected computer. Affected Software Versions =========================== - Microsoft Windows 2000 All Versions Note: Microsoft Windows NT 4.0 is not affected by this vulnerability. Patch Availability ================== Microsoft Windows 2000: - http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24229 - This patch will also be included in the next Service Pack for Windows 2000 -- it can be applied to a computer with or without Service Pack 1. 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 MS00-066, http://www.microsoft.com/technet/security/bulletin/fq00-066.asp - Microsoft Knowledge Base article Q272303 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. Revisions ========= - September 11, 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 September 11, 2000 (c) 2000 Microsoft Corporation. All rights reserved. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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