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von raredesign | Dez 3, 2019 | Allgemein | 0 Kommentare

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Current File : //usr/local/src/php7/php-7.0.5/ext/spl/tests/bug70366.phpt

--TEST--
SPL: Bug #70366 use-after-free vulnerability in unserialize() with SplDoublyLinkedList
--FILE--
<?php
class obj {
	var $ryat;
	function __wakeup() {
		$this->ryat = 1;
	}
}

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

$inner = 'i:1234;:i:1;';
$exploit = 'a:5:{i:0;i:1;i:1;C:19:"SplDoublyLinkedList":'.strlen($inner).':{'.$inner.'}i:2;O:3:"obj":1:{s:4:"ryat";R:3;}i:3;a:1:{i:0;R:5;}i:4;s:'.strlen($fakezval).':"'.$fakezval.'";}';

$data = unserialize($exploit);

var_dump($data);

function ptr2str($ptr)
{
	$out = '';
	for ($i = 0; $i < 8; $i++) {
		$out .= chr($ptr & 0xff);
		$ptr >>= 8;
	}
	return $out;
}
?>
--EXPECTF--
array(5) {
  [0]=>
  int(1)
  [1]=>
  &int(1)
  [2]=>
  object(obj)#%d (1) {
    ["ryat"]=>
    &int(1)
  }
  [3]=>
  array(1) {
    [0]=>
    int(1)
  }
  [4]=>
  string(24) "%s"
}

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