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 (MS00-060)

- --------------------------------------



Patch Available for "IIS Cross-Site Scripting" Vulnerabilities



Originally posted: August 25, 2000



Summary

=======

Microsoft has released a patch that eliminates security

vulnerabilities in Microsoft(r) Internet Information Server. The

vulnerabilities could allow a malicious web site operator to misuse another web site as a means of attacking users.



Frequently asked questions regarding this vulnerability and

the patch can be found at

http://www.microsoft.com/technet/security/bulletin/fq00-060.asp



Issue

=====

On February 20, 2000, Microsoft and CERT (www.cert.org) published

information on a newly-identified security vulnerability affected all web server products. This vulnerability, known as Cross-Site Scripting (CSS), results when web applications don't properly validate inputs before using them in dynamic web pages. If a malicious web site operator were able to lure a user to his site, and had identified a third-party web site that was vulnerable to CSS, he could potentially use the vulnerability to "inject" script into a web page created by the other web site, which would then be delivered to the user. The net effect would be to cause the malicious user's script to run on the user's machine using the trust afforded the other site.



The vulnerability can affect any software that runs on a web server, accepts user input, and blindly uses it to generate web pages. Microsoft recommended that all vendors check their products to see if any are affected by the vulnerability, and initiated a check of its own products as well. Several features in IIS were found to be affected - some were found by Microsoft internal teams, and others were identified by customers - and this patch eliminates all of them.



Affected Software Versions

==========================

 - Microsoft Internet Information Server 4.0

 - Microsoft Internet Information Server 5.0



Patch Availability

==================

 - Internet Information Server 4.0:

   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24000

 - Internet Information Server 5.0:

   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=23999



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 MS00-060,

   http://www.microsoft.com/technet/security/bulletin/fq00-060.asp

 - Information on Cross-Site Scripting Security Vulnerability,

   http://www.microsoft.com/technet/security/crssite.asp.

 - CERT(r) Advisory CA-2000-02: Malicious HTML Tags Embedded in

   Client Web Requests, http://www.cert.org/advisories/CA-2000-02.html

 - Microsoft Knowledge Base article Q260347 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 25, 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 August 25, 2000



(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.





-----BEGIN PGP SIGNATURE-----

Version: PGP Personal Privacy 6.5.3



iQEVAwUBOaaoL40ZSRQxA/UrAQE8YAf/WrYua5RRm+zEJ9reFRtRYy0I9PzkG8Uq

Wz92+Bd1kyx+WHr8odHucMCWep6cxc4yOjKjGuJ3SVWih/rCxcg+H6K45gy9SYfG

OrTFmLZ6wO51I2SlAS4vafbBLfIVK9U749Xd55qOD6200iqVZ08wIRchXLCSfiMb

db8/qfzvl4sP2bbX2CkERUg5p66rNVPi41ixkbaqaOBzjXVTEZm5l+9OdqMz/GOX

IsaFpUXpBiqEZgOiwF99+ksNupK4WZOdwlvwFZ2tCURwWJhMHKOn+pxg3qnZoN0Z

JF1cdx9yZB2M50NZvlCi4uD7lZ2rxaxrS2V7Ygfl7LKEg242NKxWJw==

=lZ2K

-----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.



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.