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ROI-Driven Cyber Risk Mitigation Using Host Compliance and Network Configuration

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Abstract

Automated cyber security configuration synthesis is the holy grail of cyber risk management. The effectiveness of cyber security is highly dependent on the appropriate configuration hardening of heterogeneous, yet interdependent, network security devices, such as firewalls, intrusion detection systems, IPSec gateways, and proxies, to minimize cyber risk. However, determining cost-effective security configuration for risk mitigation is a complex decision-making process because it requires considering many different factors including end-hosts’ security weaknesses based on compliance checking, threat exposure due to network connectivity, potential impact/damage, service reachability requirements according to business polices, acceptable usability due to security hardness, and budgetary constraints. Although many automated techniques and tools have been proposed to scan end-host vulnerabilities and verify the policy compliance, existing approaches lack metrics and analytics to identify fine-grained network access control based on comprehensive risk analysis using both the hosts’ compliance reports and network connectivity. In this paper, we present new metrics and a formal framework for automatically assessing the global enterprise risk and determining the most cost-effective security configuration for risk mitigation considering both the end-host security compliance and network connectivity. Our proposed metrics measure the global enterprise risk based on the end-host vulnerabilities and configuration weaknesses, collected through compliance scanning reports, their inter-dependencies, and network reachability. We then use these metrics to automatically generate a set of host-based vulnerability fixes and network access control decisions that mitigates the global network risk to satisfy the desired Return on Investment of cyber security. We solve the problem of cyber risk mitigation based on advanced formal methods using Satisfiability Module Theories, which has shown scalability with large-size networks.

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Authors and Affiliations

  1. Department of Software and Information Systems, University of North Carolina at Charlotte, Charlotte, NC, USA

    Mohammed Noraden Alsaleh, Ehab Al-Shaer & Ghaith Husari

Authors
  1. Mohammed Noraden Alsaleh
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  2. Ehab Al-Shaer
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  3. Ghaith Husari
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Correspondence to Mohammed Noraden Alsaleh.

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Alsaleh, M.N., Al-Shaer, E. & Husari, G. ROI-Driven Cyber Risk Mitigation Using Host Compliance and Network Configuration. J Netw Syst Manage 25, 759–783 (2017). https://doi.org/10.1007/s10922-017-9428-x

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  • DOI: https://doi.org/10.1007/s10922-017-9428-x

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