Exercise for the race condition attack

You can use Xampp for the PHP code.

1. Install the Xampp
2. Download this code in the "C:\xampp\htdocs" path.
3. Run the Xampp's "Apache" and "MySQL".
4. Go to "127.0.0.1/phpmyadmin".
5. Then import the "shop.sql" file.
6. Enjoy!

The purpose of this project is to help people learn about the Race Condition vulnerability. Do not attack the KCP api server.