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Microsoft Security Bulletin (MS00-025)
From: secnotif () MICROSOFT COM (Microsoft Product Security)
Date: Fri, 14 Apr 2000 16:54:59 -0700
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 (MS00-025) - -------------------------------------- Procedure Available to Eliminate "Link View Server-Side Component" Vulnerability Originally Posted: April 14, 2000 Summary ======= A procedure is available to eliminate a security vulnerability in several web server products. The vulnerability could allow a user who has privileges on a web server to read certain files from other web sites hosted on the same computer. Frequently asked questions regarding this vulnerability and the procedure can be found at http://www.microsoft.com/technet/security/bulletin/fq00-025.asp Issue ===== Dvwssr.dll is a server-side component used to support the Link View feature in Visual Interdev 1.0. By design, it provides .asp files to clients who have web authoring privileges on the server. However, it does not properly restrict the files that a web author can request, with the result that a user who has web authoring privileges on one web site could request .asp files from anywhere on the server, including other web sites hosted on it. However, even with this vulnerability, the component would only comply with the request if the specific file granted read access to the user. There are some significant restrictions to this vulnerability: - Only servers hosting multiple web sites could be affected by it - Only a user who has web authoring privileges for a site on the server could request a file. He would need to know the name and location of the file on the server. - The files would only be sent if their permissions granted read access to the particular user who requested them. In most cases, this would mean that the files granted read access to the Everyone group - Only .asp files (and global.asa, which is a special-case .asp file) could be retrieved. Affected Software Versions ========================== The affected component is part of Visual Interdev 1.0. However, it is a server-side component, and is included in the following products: - Windows NT 4.0 Option Pack - Personal Web Server 4.0, which ships as part of Windows 95 and 98 - Front Page 98 Server Extensions NOTE: 1. Windows 2000 is not affected by this vulnerability. Upgrading from an affected Windows NT 4.0 to Windows 2000 removes the vulnerability. 2. Installing Office 2000 Server Extensions on an affected server removes this vulnerability. 3. Installing FrontPage 2000 Server Extensions on an affected server removes this vulnerability. Remediation =========== To eliminate this vulnerability, customers who are hosting web sites should delete all copies of the file Dvwssr.dll from their servers. The FAQ provides step-by-step instructions for doing this. The only functionality lost by deleting the file is the ability to generate link views using Visual Interdev 1.0. More Information ================ Please see the following references for more information related to this issue. - Frequently Asked Questions: Microsoft Security Bulletin MS00-025, http://www.microsoft.com/technet/security/bulletin/fq00-025.asp. - Microsoft Knowledge Base article Q259799 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 =============================== Information on contacting Microsoft Technical Support is available at http://support.microsoft.com/support/contact/default.asp. Revisions ========= - April 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. Last updated April 14, 2000 (c) 2000 Microsoft Corporation. All rights reserved. Terms of use. -----BEGIN PGP SIGNATURE----- Version: PGP 6.0.2 iQEVAwUBOPev0I0ZSRQxA/UrAQHjJAf8DAQhW1/yhhQXjykTYA7veF9UBWPKUz1V cR9oN17T9QDu6r36G0ezilyQxdsvu874A9WK8zMGkrsiljxbEmXjd6OBAW0YqMrv hS4H29g1+TINXoISDIK42cuxMRlBnKBCI1z+hAjEINP1msxq8F8IIsT1OIWHSPzn aYx9eQmO2aOC6Q7ssu8GOhGzV6uP+0bhE24pApip3eV/opWtM1VgmnoMgU/P5auy 2Y/0J496oxLUynpda8qE51HGg5RmnjomdO2Y/+r9tI1iSFsRtpGDq2rmdq8/hts3 pvmFN9DzEfarQBqCflU3XIAtUuQQctDqY+d11fxJROphgwNtfdC2aQ== =RHqT -----END PGP SIGNATURE----- ******************************************************************* You have received this e-mail bulletin as a result of your registration to the Microsoft Product Security Notification Service. You may unsubscribe from this e-mail notification service at any time by sending an e-mail to MICROSOFT_SECURITY-SIGNOFF-REQUEST () ANNOUNCE MICROSOFT COM The subject line and message body are not used in processing the request, and can be anything you like. 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