Microsoft Security Bulletin (MS00-084)
Patch Available for "Indexing Services Cross Site Scripting" Vulnerability
Originally posted: November 02, 2000
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
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.
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.
NOTE: Additional security patches are available at the Microsoft Download Center
Please see the following references for more information related to 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.
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