This tweet shares a resource called 'WAF Bypass Arsenal,' which is a cheatsheet that uses full-width Unicode symbols to bypass Web Application Firewalls (WAFs). These symbols help bypass protections for vulnerabilities like Cross-Site Scripting (XSS) and Carriage Return Line Feed (CRLF) injection. The cheatsheet provides various ways to use full-width Unicode characters as payloads to evade WAF detections. Since full-width Unicode symbols look visually similar to normal characters but are encoded differently, they can slip past filters that rely on exact string matching. This technique is applicable to many WAF vendors and is a universal bypass method. It's a valuable resource for security researchers and penetration testers to understand how Unicode encodings can aid in bypassing security filters and exploiting vulnerabilities that depend on input filtering.
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