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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.215 -- Microsoft Security Bulletin (MS00-058) Patch Available for "Specialized Header" Vulnerability 17 August 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Internet Information Server Vendor: Microsoft Operating System: Windows 2000 Platform: N/A Impact: Access Privileged Data Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-058) - - -------------------------------------- Patch Available for "Specialized Header" Vulnerability Originally posted: August 14, 2000 Summary ======= Microsoft has released a patch that eliminates a security vulnerability in Internet Information Server that ships with Microsoft(r) Windows 2000. Under certain conditions, the vulnerability could cause a web server to send the source code of certain types of web files to a visiting user. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-058.asp Issue ===== If an IIS server receives a file request that contains a specialized header as well as one of several particular characters at the end, the expected ISAPI extension processing may not occur. The result is that the source code of the file would be sent to the browser. It is important to note that normal security recommendations militate strongly against ever including sensitive information in .ASP files and, if these recommendations have been followed, there would be no sensitive information to compromise. The specialized header at issue here cannot be created via a standard Internet browser, so the request would need to be created by an alternate method. Affected Software Versions ========================== - Microsoft Internet Information Server 5.0 Patch Availability ================== - http://www.microsoft.com/Downloads/Release.asp?ReleaseID=23769 Note: This vulnerability is eliminated by installing Windows 2000 Service Pack 1 http://www.microsoft.com/windows2000/downloads/recommended/sp1/ We recommend that customers apply SP1 as the preferred option for eliminating this vulnerability, as it has been fully regression tested and includes fixes for additional issues. 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 MS00-058, http://www.microsoft.com/technet/security/bulletin/fq00-058.asp - Microsoft Knowledge Base article Q256888 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 ========= August 14, 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. (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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