[MRCTF2020]套娃

01425394

打开靶机,先看源码

需要绕过两个if
第一个if屏蔽get请求语句中得_和它的url编码%5f，我们这里可以用%5F来绕过(其实根据php匹配规则 . 和 空格 也能绕过)
第二个if要求b_u_p_t值为23333且正则匹配23333，正则表达式中的 $ 默认只匹配字符串的结尾，而不会跨行检查,所以这里我们用换行符%0a绕过
最终payload：?b%5Fu%5Fp%5Ft=23333%0a
flag在secrettw.php

访问查看源码，只允许local访问，我们抓个包改client-ip值为127.0.0.1，查看源码

点击查看代码 
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jsfuck直接f12控制台粘贴执行

随便post个Merak值获得源码

";
$ip = getIp();
if($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'])); }
?>

给出了目标文件flag.php,一个change方法进行base64解密并进行ASCII 值偏移
先解决file_get_contents($_GET[‘2333’]) === ‘todat is a happy day’
用data伪协议写入即可data://text/plain,todat is a happy day
之后只需让第二个file_get_contents函数值等于flag.php就行，不过中间有个change方法，我们照着来逆向思维，先反偏移再加密就行，直接放脚本

得到ZmpdYSZmXGI=
最终payload=?2333=data://text/plain,todat is a happy day&file=ZmpdYSZmXGI=
查看源码获得flag
图片[1]-[MRCTF2020]套娃 - 千百度社区-千百度社区
flag{1defb82b-fa8e-4c03-8950-1eccc3453248}

千百度
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网络安全
# 网络安全
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用户封面
网络安全助手的头像-千百度社区
FBCS数据泄露影响了238 000名 Comcast 客户-千百度社区
FBCS数据泄露影响了238 000名 Comcast 客户
FBCS数据泄露影响了238 000名 Comcast 客户
37天前 1977
渗透测试 | 通用型漏洞挖掘实战经验分享-千百度社区
渗透测试 | 通用型漏洞挖掘实战经验分享
渗透测试 | 通用型漏洞挖掘实战经验分享
42天前 1975
Web安全知识记录-千百度社区
Web安全知识记录
Web安全知识记录
11天前 1975
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日本电产精密公司披露安全事件和数据泄露情况
日本电产精密公司披露安全事件和数据泄露情况
23天前 1969
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再谈银狐：百变木马阴魂不散
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2天前 1969
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36天前 1969