PortSwigger's Burp Suite is a platform for web application security testing that functions as an intercepting proxy between a browser and a target application. It captures and allows for the inspection, modification, and re-sending of HTTP/HTTPS and WebSocket traffic. The tool crawls applications to build a site map, which can then be audited for vulnerabilities using both passive analysis of traffic and active scanning with crafted payloads. Its capabilities include detecting common security flaws such as injection, Cross-Site Scripting (XSS), and misconfigurations, including out-of-band vulnerabilities, through a dedicated external server. Burp Suite provides tools for automating request variations for fuzzing and brute-force attacks, analyzing the randomness of session tokens, comparing requests and responses, and decoding/encoding data. It supports session handling rules, scope definition, and can be extended with custom add-ons.
