🔐 User Session Manager

📋 About This System

This system uses PHP serialization to manage user sessions securely.

All user data is serialized and stored for persistence.

⚠️ Security Notice

PHP serialization is perfectly safe when properly implemented.

Our system validates all deserialized objects before processing.

🧪 Test Serialization

💡 Hints

PHP serialization format: O:4:"User":3:{s:8:"username";s:5:"admin";...}
Magic methods: __construct(), __destruct(), __wakeup(), __toString()
POP Chain: Chain multiple objects together to achieve code execution
The flag is located at: /var/www/flag.txt
Check the source code of User.php for available classes

🔧 Example Payload Structure

// Create a User object with a file to read
$user = new User('hacker', 'admin');
$user->file = '/etc/passwd';  // Try this first
$payload = serialize($user);

// For the flag:
$user->file = '/var/www/flag.txt';

🎯 Objective: Read the contents of /var/www/flag.txt

💡 Tip: The __destruct() method is automatically called when the object is destroyed...