This lab has a "Check stock" feature that parses XML input and returns any unexpected values in the response.
To solve the lab, inject an XML external entity to retrieve the contents of the
Visit a product page, click "Check stock", and intercept the resulting POST request in Burp Suite.
Insert the following external entity definition in between the XML declaration and the
<!DOCTYPE test [ <!ENTITY xxe SYSTEM "file:///etc/passwd"> ]>
Then replace the
productId number with a reference to the external entity:
The response should contain "Invalid product ID:" followed by the contents of the