Google released a free tool Tuesday that should help Web developers find and fix cross-site vulnerabilities.
The tool, RatProxy, is described by Google as "a semi-automated, largely passive Web application security audit tool, optimized for an accurate and sensitive detection, and automatic annotation, of potential problems and security-relevant design patterns based on the observation of existing, user-initiated traffic in complex Web 2.0 environments."
The tool is versatile, detecting and ranking a broad class of vulnerabilities. Included are script injections, cross-site trust attacks, content-serving vulnerabilities, cross-site request forgeries (XSRF), and cross-site scripting (XSS).
RatProxy runs on Linux, FreeBSD, MacOS X, and Windows (Cygwin) environments.