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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.075 -- Microsoft Security Bulletin (MS00-026) Patch Available for "Mixed Object Access" Vulnerability 03 May 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Active Directory Vendor: Microsoft Operating System: MS Windows 2000 Server MS Windows 2000 Advanced Server Platform: x86 Impact: Modify Permissions Access Required: Existing User - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-026) ====================================== Patch Available for "Mixed Object Access" Vulnerability Originally Posted: April 20, 2000 Summary - - ------- Microsoft has released a patch that eliminates a security vulnerability in Microsoft(r) Windows(r) 2000 that could, under very specific conditions, allow a malicious user to change information in the Active Directory that he should not be able to change. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-026.asp Issue ===== Active Directory allows for access control of directory objects on a per-attribute basis. However, the vulnerability at issue here could allow a malicious user to modify object attributes that he does not have permission to modify, as long as he combined the operation in a particular way with ones involving attributes that he does have permission to modify. The vulnerability does not afford the malicious user an opportunity to modify all objects in a class - only the specific class objects for which he has permission to modify at least one attribute. Further, the vulnerability provides no capability to bypass normal authentication or Windows 2000 auditing, so administrators could determine if this vulnerability were being exploited, and by whom. Affected Software Versions ========================== - Windows 2000 Server - Windows 2000 Advanced Server Note The vulnerability only affects the above products when they are used as domain controllers. Patch Availability ================== - http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20490 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 MS00-026, http://www.microsoft.com/technet/security/bulletin/fq00-026.asp - Microsoft Knowledge Base article Q259401 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 Sebastien Malbois (mailto:smalbois@hotmail.com) of Bouygues Construction (http://www.bouygues-construction.com/) for reporting this issue to us and working with us to protect customers. Revisions ========= - April 20, 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 April 20, 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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