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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.131 -- Microsoft Security Bulletin (MS00-040) Patch Available for "Remote Registry Access Authentication" Vulnerability 13 June 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Remote Registry Server Vendor: Microsoft Operating System: Windows NT 4.0 Platform: N/A Impact: Denial of Service Access Required: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-040) - -----BEGIN PGP SIGNATURE----- Version: PGP 6.0.2 iQEVAwUBOUAy1o0ZSRQxA/UrAQFuWwf9FYnh1nL0kq2oeZv4X723K1k36cCHvfyL 4E3gWltp7MNf7294v8Nih94bJy1OTCvqoniAchDjgmZVN8JGndmV+GI1Ud+gjrGn t6Y1rtlbN2N2A095YC4Hr5Xc11Q+kUFVyfCn2/xlWMUHBtqg1erUIZu4Mc+2tD34 Y7X5ww3GPL95BI/3bkyIggF64uZSmXamURgEkd/9kVQOaqTNEaC5r+63H+bijD3E QqKcnWhLZiBbjajHFZbOnLXBWjW6BhNv6e6MXXj+J0W6EBq0QLCu2NvoVIiwAaT+ vB/F01UlpTMTISsFVG7YsOQnjwYFepVglE7xOatMPwQO/Uwjabgorw== =mTOp - -----END PGP SIGNATURE----- - -------------------------------------- Patch Available for "Remote Registry Access Authentication" Vulnerability Originally posted: June 08, 2000 Summary ======= Microsoft has released a patch that eliminates a security vulnerability in Microsoft(r) Windows NT 4.0. Under certain conditions, the vulnerability could be used to cause a Windows NT 4.0 machine to fail. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-040.asp Issue ===== Before a request to access the registry from a remote machine can be processed, it must first be authenticated by the Remote Registry server. If the request is malformed in a specific fashion, it could be misinterpreted by the remote registry server, causing it to fail. Because the Remote Registry server is contained within the winlogon.exe system process on Windows NT 4.0, a failure in that process would cause the entire system to fail. Only an authenticated user could levy such a request -- an anonymous (or null-session) connection could not cause this failure. An affected machine could be put back into service by rebooting. Affected Software Versions ========================== - Microsoft Windows NT 4.0 Workstation - Microsoft Windows NT 4.0 Server - Microsoft Windows NT 4.0 Server, Enterprise Edition - Microsoft Windows NT 4.0 Server, Terminal Server Edition Note: Windows 2000 is not affected by this vulnerability. Patch Availability ================== - Microsoft Windows NT 4.0 Workstation, Server, and Server, Enterprise Edition: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=21772 - Microsoft Windows NT 4.0 Server, Terminal Server Edition: To be released shortly 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 MS00-040, http://www.microsoft.com/technet/security/bulletin/fq00-040.asp - Microsoft Knowledge Base article Q264684 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 Technical Support is available at http://support.microsoft.com/support/contact/default.asp. Acknowledgments =============== Microsoft thanks Renaud Deraison from the Nessus Team (http://www.nessus.org/) for reporting this issue to us and working with us to protect customers. Revisions ========= - June 08, 2000: Bulletin Created. - --------------------------END INCLUDED TEXT-------------------- This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. 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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