Writeups for HackerOne's Hacky Holidays 2020 CTF: https://www.hackerone.com/blog/12-days-hacky-holidays-ctf
Home Page: https://limerencee.github.io/hacky-holidays-2020-writeups
你好，能请教一个问题吗？
我看你写的Evil Quiz题的答案，用的方法是
' and (select 1);--
虽然题目确实返回了非0的结果，但是我不太明白这个语句为什么能执行。
假设后端查询语句是
SELECT count(*) FROM users where username='submit_username';
注入之后就是
SELECT count(*) FROM users where username='' and (select 1);--
我在MySQL中测试，这返回的是0。
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