Description
People either love or hate math. Do you love it? Prove it! You just need to solve a bunch of equations without a mistake.
Service: 188.166.133.53:11027
Solution
Connecting to the service with nc 188.166.133.53 11027 gave me a simple equation.
I answered a few manually, but quickly realized that I had to write a script for
this.
From my manual testing I saw that the format was always of the format
x [+-*/] [number] = [number]
So I quickly hammered together a script, and crossed my fingers.
Yes, I know the code is ugly as hell. But it works.
#!/usr/bin/env python
from pwn import *
def parse_equation(indata):
equation,equals = indata.split(' = ')
new_equation = equation.lstrip('x ')
oper = new_equation[0]
if oper == '-':
new_equation = equals + ' + ' + new_equation[2:]
elif oper == '+':
new_equation = equals + ' - ' + equation[4:]
elif oper == '*':
new_equation = equals + ' / ' + equation[4:]
elif oper == '/':
new_equation = equation[4:] + ' / ' + equals
log.info('Parsed equation: ' + new_equation)
return eval(new_equation)
host = '188.166.133.53'
port = 11027
r = remote(host, port) # Connect to host
r.recv(1024) # Receive welcome line
while True:
data = r.recv(1024)
log.info(data)
junk,equation = data.split(':') # Extract equation from receive data
answer = str(parse_equation(equation.strip())) # Parse equation
log.info('Answer: ' + answer)
r.send(answer)
log.info(r.recv(1024))
r.close() # Close connectionFlag: IW{M4TH_1S_34SY}