From secnotif@MICROSOFT.COM Mon Aug 14 23:48:09 2000 From: Microsoft Product Security Resent-From: mea culpa To: MICROSOFT_SECURITY@ANNOUNCE.MICROSOFT.COM Resent-To: jericho@attrition.org Date: Mon, 14 Aug 2000 20:08:10 -0700 Subject: Microsoft Security Bulletin (MS00-058) The following is a Security Bulletin from the Microsoft Product Security Notification Service. Please do not reply to this message, as it was sent from an unattended mailbox. ******************************** -----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. 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