Combining more than one solution for VM from different vendors can be helpful in responding more quickly and thoroughly to emerging vulnerabilities. However, normalizing the output may be difficult. If you are fortunate enough to deploy more than one type of technology from the same vendor, then perhaps a unified console will eliminate this problem.
Alternative approaches are to allocate the assessment resources by organization or network. For example, it may be beneficial to use passive vulnerability scanners on a public DMZ in order to get 24-hour coverage of the security posture of the hosts. This most current assessment information can be automatically fed to a security event/incident management system (SEIM). This provides a significant advantage, for newly published vulnerabilities can be taken into account quickly when new events occur to exploit them. Active vulnerability scanners can obtain more in-depth analysis of the back-end systems and workstations where rapid response may not be as critical.
The combination of agents in DMZs and active scanners in the internal network is an excellent choice. The agents are positioned on DMZ hosts so that it is unnecessary to actively scan through the network security systems, which would otherwise require a more complex configuration. Additionally, regular audits or penetration tests of the DMZ should be conducted and agents serve as a substitute for the regular monitoring provided by active scanning.
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