Hash Collision

Introduction Context Explanation Craphp is a web-based CTF challenge where the user is presented with an interface asking for a password to retrieve a flag. The challenge also provides access to the server’s source code (index.php), which we leveraged to analyze the vulnerabilities and design a strategy for exploitation. The critical insight in solving this challenge lies in understanding and exploiting weaknesses in the use of CRC (Cyclic Redundancy Check) hash algorithms within the authentication logic....