Practitioner Lab 1: File path traversal, traversal sequences blocked with absolute path bypass

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

The application blocks traversal sequences but treats the supplied filename as being relative to a default working directory.

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



I began by looking into one of these pages which have images

I then went into the source code and took a look at where the image was being accessed



I then went into it and changed the image for the absolute path of the file /etc/passwd

This then resulted in the lab being finished.


To solve this using Burp I went into the http history and this allowed me to see the request for images.



Here I take a look at the request and then change it to the absolute path of /etc/passwd and then I get the contents of the file



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