CSICTF-Writeups/Web/Oreo

Oreo

The main idea finding the flag is just tweaking the cookies.

Step-1:

After I visited the URL: http://chall.csivit.com:30243/, this web page was shown:

Step-2:

I tried inspecting the element, but it wasn't helpful. So I checked the cookie and got a cookie flavour with value c3RyYXdiZXJyeQ%3D%3D.

Step-3:

It was simple Base64 and I decoded it to get strawberry.

Step-4:

So I got to change the flavor to chocolate as in description. So I encoded chocolate accordingly, to get:

Step-5:

I loaded that base64 encoding Y2hvY29sYXRl as a cookie and refreshed the page to get the flag.

Step-6:

Finally the flag becomes: csictf{1ick_twi5t_dunk}