[MRCTF2020]套娃

打开靶机,先看源码

1. [/code]需要绕过两个if
2. 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(实在根据php匹配规则 . 和 空格 也能绕过)
3. 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
4. 最终payload：?b%5Fu%5Fp%5Ft=23333%0a
5. flag在secrettw.php
6. 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
7. 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复制代码

jsfuck直接f12控制台粘贴执行

任意post个Merak值得到源码
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