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

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Current File : //proc/self/root/usr/local/src/php72/php-7.2.12/php-7.2.12/ext/standard/tests/strings/bug72433.phpt

--TEST--
Bug #72433: Use After Free Vulnerability in PHP's GC algorithm and unserialize
--FILE--
<?php
// Fill any potential freed spaces until now.
$filler = array();
for($i = 0; $i < 100; $i++)
	$filler[] = "";
// Create our payload and unserialize it.
$serialized_payload = 'a:3:{i:0;r:1;i:1;r:1;i:2;C:11:"ArrayObject":19:{x:i:0;r:1;;m:a:0:{}}}';
$free_me = unserialize($serialized_payload);
// We need to increment the reference counter of our ArrayObject s.t. all reference counters of our unserialized array become 0.
$inc_ref_by_one = $free_me[2];
// The call to gc_collect_cycles will free '$free_me'.
gc_collect_cycles();
// We now have multiple freed spaces. Fill all of them.
$fill_freed_space_1 = "filler_zval_1";
$fill_freed_space_2 = "filler_zval_2";
var_dump($free_me);
?>
--EXPECTF--
array(3) {
  [0]=>
  array(3) {
    [0]=>
    *RECURSION*
    [1]=>
    *RECURSION*
    [2]=>
    object(ArrayObject)#%d (1) {
      ["storage":"ArrayObject":private]=>
      *RECURSION*
    }
  }
  [1]=>
  array(3) {
    [0]=>
    *RECURSION*
    [1]=>
    *RECURSION*
    [2]=>
    object(ArrayObject)#%d (1) {
      ["storage":"ArrayObject":private]=>
      *RECURSION*
    }
  }
  [2]=>
  object(ArrayObject)#%d (1) {
    ["storage":"ArrayObject":private]=>
    array(3) {
      [0]=>
      *RECURSION*
      [1]=>
      *RECURSION*
      [2]=>
      *RECURSION*
    }
  }
}

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