Microsoft Security Bulletin (MS00-060)

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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.


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