: Indicates a target to access the /root directory, which usually contains sensitive system configuration files. How Path Traversal Vulnerabilities Work
: Often targets specific PHP functions like include() or require() . Attackers look for inputs that feed directly into file system operations. -include-..-2F..-2F..-2F..-2Froot-2F
$base_dir = '/var/www/html/uploads/'; $user_input = $_GET['file']; // Resolve the real absolute path $real_path = realpath($base_dir . $user_input); // Validate that the path starts with the allowed base directory if ($real_path !== false && strpos($real_path, $base_dir) === 0) // Safe to process file readfile($real_path); else // Access denied die("Invalid file path requested."); Use code with caution. 3. Principle of Least Privilege : Indicates a target to access the /root
Look for unusual character sequences in URL parameters, specifically .. , -2F , or %2f . Principle of Least Privilege Look for unusual character
An attacker can manipulate the page parameter. By injecting a traversal string, they force the server to exit the /var/www/html/ folder and read files elsewhere on the system. Why Attackers Use Encoding
If this payload is successful, the consequences can be severe:
Mitigating directory traversal requires a defense-in-depth approach. Here are essential countermeasures: