Lab: Insufficient workflow validation

PRACTITIONER

This lab makes flawed assumptions about the sequence of events in the purchasing workflow. To solve the lab, exploit this flaw to buy a "Lightweight l33t leather jacket".

You can log in to your own account using the following credentials: wiener:peter

Access the lab

Solution

With Burp running, log in and buy any item that you can afford with your store credit.
Study the proxy history. Observe that when you place an order, the POST /cart/checkout request redirects you to an order confirmation page. Send GET /cart/order-confirmation?order-confirmation=true to Burp Repeater.
Add the leather jacket to your basket.
In Burp Repeater, resend the order confirmation request. Observe that the order is completed without the cost being deducted from your store credit and the lab is solved.