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sqlserver防止数据库挂马新尝试

Jun 07, 2016 pm 03:14 PM
sqlserver try put database prevent

想法不错,放着以后应该会有用 网站挂马非常让人头痛,每次的安全措施都是治标不治本,想找到根本原因,只能去分析你的程序源代码,由于很多网站不是一个程序员开发,很多的注入漏洞很难发现,曾经通过公共文件加入过滤代码,基本无效,买了个叫龙盾的IIS防火

想法不错,放着以后应该会有用

网站挂马非常让人头痛,每次的安全措施都是治标不治本,想找到根本原因,只能去分析你的程序源代码,由于很多网站不是一个程序员开发,很多的注入漏洞很难发现,曾经通过公共文件加入过滤代码,基本无效,买了个叫龙盾的IIS防火墙,好像有点用,但最后还是被攻破了,sqlserver又被挂了。

  每次注入都要用“UPDATE 表名 set 字段名= REPLACE(字段名,

  网站挂马非常让人头痛,每次的安全措施都是治标不治本,想找到根本原因,只能去分析你的程序源代码,由于很多网站不是一个程序员开发,很多的注入漏洞很难发现,曾经通过公共文件加入过滤代码,基本无效,买了个叫龙盾的IIS防火墙,好像有点用,但最后还是被攻破了,sqlserver又被挂了。

  每次注入都要用“UPDATE 表名 set 字段名= REPLACE(字段名,'木马地址','')”最后一个引号真想写去死吧!

  我们不能阻止住它往数据库里挂木马,但是总有方法我们可以让它挂不成功。最后想到了触发器。熟悉触发器的都知道,sql2000插入数据和修改数据其实都是先放在inserted临时表里,然后才实际去放到对应表里。阻击黑客的脚步就这个临时表里。

  下面是一段触发器的代码,暂时对木马注入起到一定的作用。

  CREATE trigger 触发器名

  on 表名

  for update,insert

  as

  declare @a varchar(100) --存储字段1

  declare @b varchar(100) --存储字段2

  declare @c varchar(100) --存储字段3

  select @a=字段1,@b=字段2,@c=字段3 from inserted

  if(@a like '%script%' or @b like '%script%' or @c like '%script%')

  begin

  ROLLBACK transaction

  end

  这段触发器的意思是,先定义三个变量,分别存储放在inserted表里的三个容易被黑客下手的字符串型字段,然后用like模糊判断值中是否含有script字样,如果有,就回滚事务,不报错,以麻痹黑客,让他误以为已经挂好马了。各位被挂马的朋友可以把这段脚本拿去,对应着修改,应该可以保证网站不被挂马。另外容易被挂马的字段还有text型,但是这个类型处理比较麻烦点,而且观察发现黑客挂一个表往往是好几个字段同时挂,所以只要一个字段不成功,整个表都是不成功的。

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