Natas Level 5
We need to analyze the HTTP response in order to succeed in this level
Quest
We are presented with a webpage with a simple message “Access disallowed. You are not logged in” as shown below

Solution
Below is the request and response in Burp. Notice the Header in the response : Set-Cookie: loggedin=0.
The Set-Cookie header is used to set the cookies that will be sent in the subsequent requests.

If we change its value to loggedin=1 indicating success (means we have already logged in successfully), we might get in.
And Indeed, we can see above that this worked, and we have the password for next Level.