DNS缓存病毒又称DNS欺骗,是一种通过查找并利用DNS系统中存在的漏洞,将流量从合法服务器引导至虚假服务器上的攻击方式。
在实际的DNS解析过程中,用户请求某个网站,浏览器首先会查找本机中的DNS缓存,如果DNS缓存中记录了该网站和IP的映射关系,就会直接将结果返回给用户,用户对所得的IP地址发起访问。如果缓存中没有相关记录,才会委托递归服务器发起递归查询。
这种查询机制,缩短了全球查询的时间,可以让用户获得更快的访问体验,但也存在一定的安全风险。如果攻击者通过控制用户的主机或者使用恶意软件攻击用户的DNS缓存,就可以对DNS缓存中的域名映射关系进行篡改,将域名解析结果指向一个虚假IP。
最强防护段文章来源:https://www.toymoban.com/news/detail-614253.html
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