This tweet introduces a bypass technique called 'Full-Width Unicode Symbols Cheatsheet' which can be used to bypass Web Application Firewalls (WAFs) for vulnerabilities like Cross-Site Scripting (XSS) and CRLF injection. Full-Width Unicode Symbols are characters that look like regular ASCII characters but have different Unicode code points, making it harder for filtering engines in WAFs to detect malicious payloads. By using these symbols, attackers can obfuscate payloads and bypass security rules that rely on pattern matching. This technique can be effective against many WAF vendors as it targets the fundamental mechanism of pattern detection and filtering, thereby making it a universal bypass method. The post linked likely contains a cheatsheet of these symbols to help penetration testers or attackers craft payloads that evade detection.
For more details, check out the original tweet here: https://twitter.com/HackingTeam777/status/1936205501660119190