This tweet references a WAF bypass technique that involves using 'junk data' to evade detection. The trick has been known for around 13 years, indicating a long-standing method that attackers can use to circumvent Web Application Firewalls. Though the tweet does not specify a particular vendor, such bypasses are generally universal, affecting multiple WAF products that do not robustly handle extraneous or irrelevant input data in the request payload. By injecting junk data, attackers may confuse the filtering mechanisms, allowing malicious payloads to pass through undetected. The tweet also includes a statement regarding HackerOne, a bug bounty platform, labeling it negatively but this is unrelated to the technical WAF bypass discussion.
Original tweet: https://twitter.com/h4x0r_dz/status/1945886340093976723