bug70284.phpt   [plain text]

--TEST--
Bug #70284 (Use after free vulnerability in unserialize() with GMP)
--SKIPIF--
<?php if (!extension_loaded("gmp")) print "skip"; ?>
--FILE--
<?php

$inner = 'r:2;a:1:{i:0;a:1:{i:0;r:4;}}';
$exploit = 'a:2:{i:0;s:1:"1";i:1;C:3:"GMP":'.strlen($inner).':{'.$inner.'}}';

$data = unserialize($exploit);

$fakezval = ptr2str(1122334455);
$fakezval .= ptr2str(0);
$fakezval .= "\x00\x00\x00\x00";
$fakezval .= "\x01";
$fakezval .= "\x00";
$fakezval .= "\x00\x00";

for ($i = 0; $i < 5; $i++) {
	$v[$i] = $fakezval.$i;
}

var_dump($data);

function ptr2str($ptr)
{
$out = '';
	for ($i = 0; $i < 8; $i++) {
		$out .= chr($ptr & 0xff);
		$ptr >>= 8;
	}
	return $out;
}
?>
--EXPECTF--
array(2) {
  [0]=>
  string(1) "1"
  [1]=>
  object(GMP)#%d (2) {
    [0]=>
    array(1) {
      [0]=>
      NULL
    }
    ["num"]=>
    string(1) "1"
  }
}