Published:
02 November 2000
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.330 -- Microsoft Security Bulletin (MS00-060) Patch Available for "IIS Cross-Site Scripting" Vulnerabilities - Updated 3 November 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Internet Information Server Vendor: Microsoft Impact: Execute Arbitrary Code/Commands Access Required: Remote Ref: ESB-2000.230 ESB-2000.023 ESB-2000.025 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-060) - - -------------------------------------- Patch Available for "IIS Cross-Site Scripting" Vulnerabilities Originally posted: August 25, 2000 Updated: November 2, 2000 Summary ======= On August 25, 2000, Microsoft released the original version of this bulletin, to advise customers of the availability of a patch that eliminates a vulnerability in Microsoft(r) Internet Information Server. However, an additional variant of the vulnerability was subsequently identified, and on November 2, 2000, the bulletin was updated to advise customers of the availability of an updated patch. The scope of the new vulnerability is exactly the same as that of the originally-reported one. The updated patch eliminates all known variants of the vulnerability. Customers who applied the original version of the patch should apply the new version to ensure that they are fully protected. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-060.asp Issue ===== On February 20, 2000, Microsoft and CERT published information on a newly-identified security vulnerability affecting all web server products. This vulnerability, known as Cross-Site Scripting (CSS), results when web applications don't properly validate inputs before using them in dynamic web pages. If a malicious web site operator were able to lure a user to his site, and had identified a third-party web site that was vulnerable to CSS, he could potentially use the vulnerability to "inject" script into a web page created by the other web site, which would then be delivered to the user. The net effect would be to cause the malicious user's script to run on the user's machine using the trust afforded the other site. The vulnerability can affect any software that runs on a web server, accepts user input, and blindly uses it to generate web pages. Microsoft recommended that all vendors check their products to see if any are affected by the vulnerability, and initiated a check of its own products as well. Several features in IIS were found to be affected - some were found by Microsoft internal teams, and others were identified by customers - and this patch eliminates all of them. Affected Software Versions ========================== - Microsoft Internet Information Server 4.0 - Microsoft Internet Information Server 5.0 Patch Availability ================== - Internet Information Server 4.0: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=25534 - Internet Information Server 5.0: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=25533 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 MS00-060, http://www.microsoft.com/technet/security/bulletin/fq00-060.asp - Information on Cross-Site Scripting Security Vulnerability, http://www.microsoft.com/technet/security/crssite.asp. - CERT(r) Advisory CA-2000-02: Malicious HTML Tags Embedded in Client Web Requests, http://www.cert.org/advisories/CA-2000-02.html - Microsoft Knowledge Base article Q260347 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. Acknowledgments =============== Microsoft thanks Microsoft thanks Peter Grundl of Defcom (www.defcom.com) for reporting the new variant of this issue to us and working with us to protect customers. Revisions ========= - August 25, 2000: Bulletin Created. - November 2, 2000: Bulletin updated to announce availability of a patch to eliminate a new variant of this issue. 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 November 2, 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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