Network risk evaluation from security metric of vulnerability detection tools

Network Security is always a major concern in any organizations. To ensure that the organization network is well prevented from attackers, vulnerability assessment and penetration testing are implemented regularly. However, it is a highly time-consuming procedure to audit and analysis these testing results depending on administrator's expertise. Thus, security professionals prefer proactive-automatic vulnerability detection tools to identify vulnerabilities before they are exploited by an adversary. Although these vulnerability detection tools show that they are very useful for security professionals to audit and analysis much faster and more accurate, they have some important weaknesses as well. They only identify surface vulnerabilities and are unable to address the overall risk level of the scanned network. Also, they often use different standard for network risk level classification which habitually related to some organizations or vendors. Thus, these vulnerability detection tools are likely to, more or less, classify risk evaluation biasedly. This article presents a generic idea of “Network Risk Metric” as an unbiased risk evaluation from several vulnerability detection tools. In this paper, NetClarity (hardware-based), Nessus (software-based), and Retina (software-based) are implemented on two networks from an IT department of the Royal Thai Army (RTA). The proposed metric is applied for evaluating overall network risk from these three vulnerability detection tools. The result is a more accurate risk evaluation for each network.