Assessing risks in .NET

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Risk is the possibility of loss or injury. Risk management in general comprises two major activities: assessing what the risks are, and eliminating or mitigating the risks. The former is called risk assessment, and the latter is called risk mitigation. In security, risk management involves assessing and mitigating risk of loss due to security violations. From a security pattern perspective, risk assessment is a bounded problem that can be described in a few patterns. Security risk mitigation, on the other hand, is a very large area that involves most of the security disciplines, including policies, services, mechanisms, management, and operations. Therefore, risk assessment patterns are presented in this chapter, while risk mitigation is implicitly addressed in the subsequent patterns in this chapter and succeeding chapters. Risk assessment in general can be performed in a quantitative or qualitative manner. A quantitative approach attempts to measure factors with precise metrics. A qualitative approach uses more relative or subjective measures such as rankings. The risk patterns provided in this chapter do not require that precise metrics be used, and the guidance uses qualitative scoring. However, the authors realize that quantitative risk assessments can also prove useful for some enterprises. If you are using the patterns and have quantitative metrics available for the factors, you can apply the patterns in a quantitative manner. We need to make a clarifying point about risk management as addressed in this book. Most of the security risk literature refers to systems instead of enterprises, that is, most risk-related activity has traditionally been done at a system level, while we are presenting risk assessment at the enterprise-wide level. Our risk assessment pattern system and the patterns that it contains are general enough that they can be applied at the strategic enterprise level, and can also be applied to each system. Some risk mitigation occurs at the enterprise level, but most mitigation and safeguarding occurs at the system or operational level. Assume that you have determined your security needs and risks at the enterprise level, and you want to put in place the safeguards to protect organizational assets and mitigate risks. The safeguards include security services and mechanisms. They typically exist at the system or operational level, and are covered in the chapters that follow. It is difficult to make a direct connection between the organizational needs and risks, on one hand, and the design and implementation of system services, on the other hand. The two patterns in this section are designed to bridge the gap. First, ENTERPRISE SECURITY APPROACHES (148) helps to map basic the security approaches of prevention, detection, and response to the organizational needs and risks. Second, ENTERPRISE SECURITY SERVICES (161) identifies services, such as identification and authentication or access control, that correspond to a selected approach to protect assets and mitigate risks. For example, suppose that you have identified enterprise financial data as an asset that needs to be kept confidential from competitors. It would be better to prevent unauthorized disclosure from occurring than to detect when such disclosure occurs and
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Enterprise Security and Risk Management
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try to recover from it. A typical security service to achieve prevention is access control. In this example, ENTERPRISE SECURITY APPROACHES (148) helps to select prevention as the appropriate approach, and ENTERPRISE SECURITY SERVICES (161) helps to identify access control as an appropriate service. Note in the latter case that ENTERPRISE SECURITY SERVICES (161) does not specify how access control will be achieved that is the purpose of access control patterns in later chapters. How can an enterprise protect its assets in its interaction with external partners ENTERPRISE PARTNER COMMUNICATION (173) is intended to help achieve this goal. It is the final pattern presented in this chapter. The risk patterns in this chapter, and the ENTERPRISE PARTNER COMMUNICATION (173) pattern, were written by Sasha Romanosky. The remaining patterns were written by a team at the MITRE Corporation consisting of Jody Heaney, Duane Hybertson, Susan Chapin, Malcolm Kirwan Jr. and Ann Reedy. Hybertson and Romanosky wrote the introductory material for the chapter, and Duane integrated the material into the chapter. Frank Buschmann and Peter Sommerlad provided helpful shepherding comments for the MITRE patterns. Aaldert Hofman and Duane Hybertson provided shepherding comments for Sasha s patterns. Markus Schumacher provided helpful comments on integrating the material into the chapter.
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