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Lab: Blind OS command injection with time delays


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 output from the command is not returned in the response.

To solve the lab, exploit the blind OS command injection vulnerability to cause a 10 second delay.


  1. Use Burp Suite to intercept and modify the request that submits feedback.
  2. Modify the email parameter, changing it to:

  3. Observe that the response takes 10 seconds to return.

Community solutions

Rana Khalil
Michael Sommer