On December 13, 2008, Microsoft released the Microsoft Anti-Cross Site Scripting Library v3.0 Beta available for download:
"The Microsoft Anti-Cross Site Scripting Library V3.0 (Anti-XSS V3.0) is an encoding library designed to help developers protect their ASP.NET web-based applications from XSS attacks. It differs from most encoding libraries in that it uses the white-listing technique -- sometimes referred to as the principle of inclusions -- to provide protection against XSS attacks. This approach works by first defining a valid or allowable set of characters, and encodes anything outside this set (invalid characters or potential attacks). The white-listing approach provides several advantages over other encoding schemes. New features in this version of the Microsoft Anti-Cross Site Scripting Library include: - An expanded white list that supports more languages - Performance improvements - Performance data sheets (in the online help) - Support for Shift_JIS encoding for mobile browsers - A sample application - Security Runtime Engine (SRE) HTTP module"
You can download the Microsoft Anti-Cross Site Scripting Library V3.0 Beta here.
As an FYI, you can also download the XSS Detect Beta Code Analysis Tool:
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