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Lab: File path traversal, traversal sequences stripped with superfluous URL-decode


This lab contains a path traversal vulnerability in the display of product images.

The application blocks input containing path traversal sequences. It then performs a URL-decode of the input before using it.

To solve the lab, retrieve the contents of the /etc/passwd file.


  1. Use Burp Suite to intercept and modify a request that fetches a product image.
  2. Modify the filename parameter, giving it the value:

  3. Observe that the response contains the contents of the /etc/passwd file.

Community solutions

Michael Sommer