Global Community CTF: Mini Bootup by SANS – NM02

Question:

This server is trying to get us to run some calculations but it's just too fast for us. Can you work out a way to solve this?

Domain: cgames-nm02.allyourbases.co Port: 9010

Let’s try connect to the domain & port given via netcat

Hmm. There’s mathematic question that we need to solve. But we’re too slow on solving it..

What if we create a bot to solve those question?

import pwn
import re

host, port = 'cgames-nm02.allyourbases.co', 9010
session = pwn.remote(host, port)

while True:
	try:
		what = session.recv(1024)
		questionrm = (what.replace('=','')) #remove =
		print "Q: " + questionrm
		
		math = eval(questionrm)
		math_str = str(math)
		print "AS: " + math_str
		
		print session.sendline(math_str)
		print session.recvline()
	except EOFError:
		print('Done!')
		break
    
session.close()

Save it & run. Watch the magic happen…

The flag is: SuperServer1337