Security Bulletin (MS00-025)

2000-04-1500:00:00

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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:

Windows 2000 is not affected by this vulnerability. Upgrading
from an affected Windows NT 4.0 to Windows 2000 removes the
vulnerability.
Installing Office 2000 Server Extensions on an affected server
removes this vulnerability.
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

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