CTFlearn-Writeups/Binary/Lazy Game Challenge

Lazy Game Challenge

The main idea finding the flag is thinking differently to break the logic in binary file.

Step-1:

After pwning into the given machine: nc thekidofarcrania.com 10001, we are asked to play a betting game.

Step-2:

I input Y and proceed to see the game. According to given scenario, I seemed to lose every bet of 100$. So I had to do something differently.

Step-3:

This time I placed a bet of a hefty number like 1000000$ which I didn't even possess. I spit out errors. :(

Step-4:

But the main idea in pwning lies in abnormal thinking and that's where you focus. I tried out negative number this time for the bet like -100000$. I still could play, it shows there was a program logic flaw there.

Now I went wild to give all numbers (which I had to guess below 10) greater than 10. Finally it gave me flag.

Step-3:

Finally the flag becomes: CTFlearn{d9029a08c55b936cbc9a30_i_wish_real_betting_games_were_like_this!}