以下有关网站攻击防护及安全监测技术的说法，错误的（ ）。
- A.Web应用防火墙针对80、443端口
- B.包过滤防火墙只能基于IP层过滤网站恶意包
- C.利用操作系统的文件调用事件来检测网页文件的完整性变化，可以发现网站被非授权修改
- D.网络流量清洗可以过滤掉针对目标网络攻击的恶意网络流量
正确答案及解析
正确答案
解析
参见《信息安全工程师5天修炼》Web防火墙部分。Web应用防火墙可以防止SQL注入、xss攻击、恶意文件上传、远程命令执行、文件包含、恶意扫描拦截等；可以发现并拦截恶意的Web代码；可防止网站挂马、后门上传拦截等。所以说Web应用防火墙针对80、443端口的表述是错误的。
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