Going to the provided URL gives us the following panel
Key this to note here are :-
- Blue is my favourite colour
- We have an input box and a submit button
Lets try to provide some input let's say blue, we got nothing different and url looks like as below
- http://<...>/check?name=blue
Let's take a look at source by inspecting
Looking at index file don't gave any foothold
Looking at css file (base_cookie.css) and looking at end we get somthing suspecious
Modifying the URl as
- http://<...>/check?C0loR=blue
And we get the flag
Hints with point values (cost) :-
- Hint 1 :- The key is finding and value is the favourite thing....