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

PRACTITIONER

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.

Solution

Use Burp Suite to intercept and modify a request that fetches a product image.
Modify the filename parameter, giving it the value /etc/passwd.
Observe that the response contains the contents of the /etc/passwd file.

Community solutions

zenshell

Intigriti

Michael Sommer

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