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
=======
On April 14, 2000, Microsoft issued the original version of this
bulletin, to discuss a security vulnerability affecting several web
server products. Shortly after publishing the bulletin, we learned of
a new, separate vulnerability that significantly increases the threat
to users of these products. The remediation is the same as originally
described, so any customers who followed the original recommendations
would not need to take additional steps. However, some customers who
did not need to take action based on the original assessment may need
to do so now.
A procedure is available to eliminate a security vulnerability that
could allow a malicious user to cause a web server to crash.
Microsoft is investigating the possibility that the vulnerability also
would allow a malicious user to run arbitrary code on the server, and
will update this bulletin when this is known.
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. However, it contains an unchecked
buffer. If overrun with random data, it could be used to cause an
affected server to crash.
Microsoft is continuing to investigate this issue in order to
determine whether there also is a capability to run arbitrary code on
the server. We will update this bulletin when these results are known.
However, the threat posed by the denial of service case alone is
sufficient to warrant taking the remediation steps detailed below.
Customers who take these steps now will not need to take additional
steps regardless of the final outcome of the investigation.
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, which is the primary distribution
mechanism for Internet Information Server 4.0
- 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
using any of the affected products 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
iQEVAwUBOPgRio0ZSRQxA/UrAQHktgf8Cg8RykAHwbr0ejOdNUslR6503rl5hONe
2mtm2MoEGF09yrvOZOEIMbXhLKMGYlQkr4Wfu/5/cY9WCvoUgh2Z5kaxrYsUh6rN
qsgu5omqfFeUIbuM8L4ZNXVmTTbz0nO9+pk+owlbhTnTyfKJDPodcCS8a0mW0X9j
K06jjP/IM07dKaFawN1d0fIUyWwhRShEmlSh9lRd9cEU1kTvTT1/NfySzDkVxy8H
nquA8AegLAu2Laa42dhO7d0GPk9NBMCjTOh/FVJ2I0HBJDRn4CeRB8sjGMgnyuJl
DkRfl+jv/SdCNcx8FZ+4dFErn10M7zlUEde/jjwV3hA3Dz+05nTCDw==
=8Ahw
-----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 [EMAIL PROTECTED]
The subject line and message body are not used in processing the request,
and can be anything you like.
To verify the digital signature on this bulletin, please download our PGP
key at http://www.microsoft.com/technet/security/notify.asp.
For more information on the Microsoft Security Notification Service
please visit http://www.microsoft.com/technet/security/notify.asp. For
security-related information about Microsoft products, please visit the
Microsoft Security Advisor web site at http://www.microsoft.com/security.
