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
Updated: April 17, 2000
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 increased the threat to users of
these products. We updated the bulletin later on April 14, 2000, to
advise customers of the new vulnerability, and noted that we would
provide additional details when known. On April 17, 2000, we updated
the bulletin again to provide those details.
A procedure is available to eliminate a security vulnerability that
could allow a malicious user to cause a web server to crash, or
potentially run arbitrary code on the server, if certain permissions
have been changed from their default settings to inappropriate ones.
Although this bulletin has been updated several times as the
investigation of this issue has progressed, the remediation steps
have always remained the same - customers running affected web servers
should delete the affected file, Dvwssr.dll. Customers who have done
this at any point in the past do not need to take any further action.
Frequently asked questions regarding this vulnerability and
the procedure can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-025.asp
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, or could allow arbitrary code to run on the
server in a System context.
By default, the affected component, Dvwssr.dll, resides in a folder
whose permissions only allow web authors to execute it. Under these
conditions, only a person with web author privileges could exploit the
vulnerability - but a web author already has the ability to upload
and execute code of his choice, so this case represents little
additional threat. However, if the permissions on the folder were set
inappropriately, or the .dll were copied to a folder with lower
permissions, it could be possible for other users to execute the
component and exploit the vulnerability.
The affected component is part of Visual Interdev 1.0. However, it is
a server-side component, and is included in the following products:
NOTE:
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 of .asp pages using
Visual Interdev 1.0.
Please see the following references for more information related to
this issue.
Information on contacting Microsoft Technical Support is available
at http://support.microsoft.com/support/contact/default.asp.
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 17, 2000
(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.
-----BEGIN PGP SIGNATURE-----
Version: PGP 6.0.2
iQEVAwUBOPtK540ZSRQxA/UrAQFLNAf/f+J9Gu2bLni4x+CD2TxY4LZXsCLGkQgq
hXiEcNVlqccSClIRg84zlYL2KDGkDCwQWtE8JR93V0MkirOdpY9rCW39DWCzJxo0
2wKI9NaPJl8cgbMiFWpRErw8ojHoX+fgtWqBGbGnZPxShCmQOVh/xBLvjCz1KakZ
GrzNecfyK58aT3Ao2w8uxAfLp8z0Kzuaj+YYmkLq36/TPUkBmBJHsDOBP++3WoDA
1Dxe9/zahwMd7wwtwdQGtFUD9iQYVB3zd8QnYZCiwUOJR6fLc2nsj4AtylFynqRD
Mg4lsvMjDzHZj6p5JMbxpzebymWTjPgTd5hr66ZBdtb8CdwisV/oig==
=6B1q
-----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.