1. Web Security Academy
  2. OS command injection
  3. Lab

Lab: Blind OS command injection with out-of-band data exfiltration


This lab contains a blind OS command injection vulnerability in the feedback function.

The application executes a shell command containing the user-supplied details. The command is executed asynchronously and has no effect on the application's response. It is not possible to redirect output into a location that you can access. However, you can trigger out-of-band interactions with an external domain.

To solve the lab, execute the whoami command and exfiltrate the output via a DNS query to the public Burp Collaborator server (burpcollaborator.net). You will need to enter the name of the current user to complete the lab.


You must use the public Burp Collaborator server (burpcollaborator.net).