Abstract. The security risk of a network against unknown zero day attacks has been considered as something unmeasurable since software flaws are less predictable than hardware faults and the process of finding such flaws and developing exploits seems to be chaotic. In this paper, we propose a novel security metric, k-zero day safety, based on the number of unknown zero day vulnerabilities. That is, the metric simply counts how many unknown vulnerabilities would be required for compromising a network asset, regardless of what vulnerabilities those might be. We formally define the metric based on an abstract model of networks and attacks. We then devise algorithms for computing the metric. Finally, we show the metric can quantify many existing practices in hardening a network.
For example, Wang et al. REF defined a network security metric, k-zero day safety, for measuring the risk of unknown vulnerabilities based on the number of unknown vulnerabilities required for compromising network assets.
k-zero day safety: Measuring the security risk of networks against unknown attacks
ESORICS
Computer Science