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DefConCTF 2015 Quals - Mathwize Writeup

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DefConCTF 2015 Mathwize Writeup
Point = 1
Category = Coding

We just given the dest address.

mathwhiz_c951d46fed68687ad93a84e702800b7a.quals.shallweplayaga.me:21249

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nc mathwhiz_c951d46fed68687ad93a84e702800b7a.quals.shallweplayaga.me 21249
1 + 1 =

It’s seems we should just answer all the questions.

but among using a script to answer all, i see following patterns:

  1. using [ and ] instead of (, )
  2. using { , } instead of (, )
  3. using ONE, TWO, THREE, instead of 1, 2, 3

So here is my completely dirty solution :) :

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import socket


s = socket.create_connection(("mathwhiz_c951d46fed68687ad93a84e702800b7a.quals.shallweplayaga.me", 21249))


while True:
    a = s.recv(1024)
    print a
    b = eval(a.replace("=", "").replace("{", "(").replace("}", ")").replace("ONE", "1").replace("TWO", "2").replace("THREE", "3").replace("^", "**").replace("[", "(").replace("]", ")"))
    print b
    s.send(str(b)+"\n")

And finally:

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$ python mathwize-sol.py
[..]

You won!!!
The flag is: Farva says you are a FickenChucker and you'd better watch Super Troopers 2

another 1 point ;)

@HAMIDx9

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