Security Bulletin (MS00-084)

2000-11-0400:00:00

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Microsoft Security Bulletin (MS00-084)

Patch Available for "Indexing Services Cross Site Scripting"
Vulnerability

Originally posted: November 02, 2000

Summary

Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Indexing Services for Windows 2000.
This vulnerability 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/fq00-084.asp

Issue

On February 20, 2000, Microsoft and the CERT Coordination Center
published information on a newly-identified security vulnerability
affecting 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 uses it to generate web pages without
sufficient validation. Microsoft has identified an Indexing Service
component (CiWebHitsFile) that, when called from a specially crafted
URL, is vulnerable to this scenario.

Affected Software Versions

Microsoft Indexing Services for Windows 2000

NOTE: The Indexing Service ships and installs with Windows 2000, but
is not enabled by default. Users who are running web servers on
Windows 2000 who have enabled Indexing Services are urged to apply
this patch.

Patch Availability

Indexing Services for Windows 2000:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=25517

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 MS00-084,
http://www.microsoft.com/technet/security/bulletin/fq00-084.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 Q278499 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

November 02, 2000: Bulletin Created.

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