This tweet shares a blog post explaining a prototype method to bypass Web Application Firewalls (WAF) using XML encoding to exploit SQL injection vulnerabilities. The bypass technique specifically focuses on filtering evasion to perform UNION-based data extraction. The method involves encoding the payload in XML format, which helps to avoid detection by security filters. PortSwigger LAB, known for its web security research and tools like Burp Suite, provides this explanation. The technique allows attackers to extract data from the database by effectively bypassing WAF rules designed to block standard SQL injection payloads. This approach highlights the importance of comprehensive input sanitization and advanced detection mechanisms in modern WAFs to counteract such encoding-based bypasses.
For more details, check out the original tweet here: https://twitter.com/aixnoa/status/1956125278033559724