sha2017-asby-full.py

#!/usr/bin/python

import os
import pwn
import string
import sys

pwn.context.log_level = 'error'

existingflag = "flag{"
c = 0
tries = 0
while c < len(string.printable):
  p = pwn.process(["wine","asby.exe"])
  d = p.readuntil("?")
  flag = existingflag + string.printable[c]
  p.sendline(flag + ">")
  data = p.readuntil("WRONG",timeout=1.0)
  dx = "%d:CORRECT" % (len(existingflag) + 1)
  print flag
  if dx in data:
    existingflag += string.printable[c]
    c = 0
    print data
    continue
  c += 1
  tries += 1
  p.kill()

print tries