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--TEST--
Bug #70436: Use After Free Vulnerability in unserialize()
--FILE--
<?php
class obj implements Serializable
{
var $data;
function serialize()
{
return serialize($this->data);
}
function unserialize($data)
{
$this->data = unserialize($data);
}
}
$fakezval = ptr2str(1122334455);
$fakezval .= ptr2str(0);
$fakezval .= "\x00\x00\x00\x00";
$fakezval .= "\x01";
$fakezval .= "\x00";
$fakezval .= "\x00\x00";
$inner = 'C:3:"obj":3:{ryat';
$exploit = 'a:4:{i:0;i:1;i:1;C:3:"obj":'.strlen($inner).':{'.$inner.'}i:2;s:'.strlen($fakezval).':"'.$fakezval.'";i:3;R:5;}';
$data = unserialize($exploit);
var_dump($data);
function ptr2str($ptr)
{
$out = '';
for ($i = 0; $i < 8; $i++) {
$out .= chr($ptr & 0xff);
$ptr >>= 8;
}
return $out;
}
?>
DONE
--EXPECTF--
Notice: unserialize(): Error at offset 0 of 3 bytes in %sbug70436.php on line %d
Notice: unserialize(): Error at offset 17 of 17 bytes in %sbug70436.php on line %d
Notice: unserialize(): Error at offset 93 of 94 bytes in %sbug70436.php on line %d
bool(false)
DONE
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