||Home : Advisories : Patch Available for "IIS Cross-Site Scripting" Vulnerabilities|
||Patch Available for "IIS Cross-Site Scripting" Vulnerabilities
||25th August 2000
The following is a Security Bulletin from the Microsoft Product Security Notification Service.
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Microsoft Security Bulletin (MS00-060)
Patch Available for "IIS Cross-Site Scripting" Vulnerabilities
Originally posted: August 25, 2000
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
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
- Internet Information Server 4.0:
- Internet Information Server 5.0:
Note: Additional security patches are available at the Microsoft
Please see the following references for more information related to this issue.
- Frequently Asked Questions: Microsoft Security Bulletin MS00-060,
- Information on Cross-Site Scripting Security Vulnerability,
- 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,
Obtaining Support on this Issue
This is a fully supported patch. Information on contacting Microsoft Product Support Services is available at
- August 25, 2000: Bulletin Created.
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Last Updated August 25, 2000
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