Quantitative Penetration Testing with Item Response Theory

Florian Arnold, Wolter Pieters, Mariëlle Ida Antoinette Stoelinga

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    Existing penetration testing approaches assess the vulnerability of a system by determining whether certain attack paths are possible in practice. Thus, penetration testing has so far been used as a qualitative research method. To enable quantitative approaches to security risk management, including decision support based on the cost-effectiveness of countermeasures, one needs quantitative measures of the feasibility of an attack. Also, when physical or social attack steps are involved, the binary view on whether a vulnerability is present or not is insufficient, and one needs some viability metric. When penetration tests are performed anyway, it is very easy for the testers to keep track of, for example, the time they spend on each attack step. Therefore, this paper proposes the concept of quantitative penetration testing to determine the difficulty rather than the possibility of attacks based on such measurements. We do this by step-wise updates of expected time and probability of success for all steps in an attack scenario. In addition, we show how the skill of the testers can be included to improve the accuracy of the metrics, based on the framework of Item Response Theory (Elo ratings). We prove the feasibility of the approach by means of simulations, and discuss application possibilities.
    Original languageUndefined
    Pages (from-to)118-127
    Number of pages10
    JournalJournal of information assurance and security
    Issue number3
    Publication statusPublished - 2014


    • quantitative security
    • EC Grant Agreement nr.: FP7/2007-2013
    • EC Grant Agreement nr.: FP7/318003
    • EWI-25266
    • Security Metrics
    • Item Response Theory
    • Penetration Testing
    • Socio-technical security
    • METIS-309643
    • IR-92536

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