Scanning multiple Apache VirtualHosts with Nessus
Web sites have a way of evading vulnerability scanners in the form of virtual hosting. It is a common practice to host multiple web-sites (and associated applications) on a single web server using only one IP addresses. This causes problems for vulnerability scanners, including Nessus, as they look for vulnerabilities on the single IP or hostname provided.
The remote server directs this traffic to a specific virtual host or web application, leaving a considerable amount of virtual real-estate untouched. The problem is that Nessus has no easy way to enumerate the domain names or additional IP addresses associated with a given system. Scanning every hostname, domain name and IP address associated with the server could reveal additional vulnerabilities in the web applications or hosts associated with the given server.
At the Tenable blog.
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