Summary

  • The article discusses creating a server to exploit Cross-Origin Resource Sharing (CORS) vulnerabilities, a common security issue.
  • The server is built using Express.js or Flask in Python, two lightweight and popular web development frameworks.
  • The server is configured to listen on a specific port, and it has a single endpoint defined for logging data.
  • When a client accesses this endpoint (with a key parameter), the server logs the exfiltrated data (or key) and responds with a success message.
  • To access the server locally, npm start is used for Express.js and python app.run() for Flask.
  • Using Ngrok, port-forwarding allows the server to be accessed remotely, useful for vulnerabilities that require an attacker to attract a target to a malicious server.

By Mr Horbio

Original Article