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Security Risk Management. Liping Cai 02/01/2006. Agenda. Overview Reactive Vs. Proactive approaches Quantitative risk management or qualitative risk management Assessing Risk Conducting Decision Support Implementing Controls Measuring Program Effectiveness.
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Security Risk Management Liping Cai 02/01/2006
Agenda • Overview • Reactive Vs. Proactive approaches • Quantitative risk management or qualitative risk management • Assessing Risk • Conducting Decision Support • Implementing Controls • Measuring Program Effectiveness
Introduction – why, who, what? • Why this guide? -- The environmental Challenge -- New legislation -- lack of in-house expertise, budget resources, and guidelines to outsource • Who should read this Guide? -- Architects and planners -- Members of the information security team -- Security and IT auditors -- Senior executives, business analysts and BDMs -- Consultants and partners. • What is in the guide? -- Survey of Security Risk Management practice -- Security Risk Management Process: Assessing Risk Conducting Decision Support Implementing Controls Measuring Program Effectiveness
Reactive Approaches to Risk Management Protect human life and people’s safety should always be your first priority. Contain the harm that the attack caused helps to limit additional damage. Determine the extent of the damage that the attack caused right after you contain the situation and duplicate the hard disks. Understand the resources at which attack was aimed and what vulnerabilities were exploited to gain access or disrupt services. Damage should be repaired as quickly as possible to restore normal business operations and recover data lost during the attack. Review the process thoroughly. Determine with your team the steps that were executed successfully and what mistakes were made.
Proactive Approachesto Risk Management • Instead of waiting for bad things to happen and then responding to them afterwards, you minimize the possibility of the bad things ever occurring in the first place. • Common high-level procedures: -- Identify business assets; -- Determine what damage an attack against an asset could cause to the organization. -- Identify the security vulnerabilities that the attack could exploit. -- Determine how to minimize the risk of attack by implementing appropriate controls.
Approaches to Risk Prioritization -- Quantitative Risk Management • The goal is to try to calculate objective numeric values for each of the components gathered during the risk assessment and cost – benefit analysis. • Valuing Assets:The overall of the asset to your organization; The immediate financial impact of losing the asset; The indirect business impact of losing the asset. • Determining the Single Loss Expectancy(SLE) :SLE is the total amount of revenue that is lost from a single occurrence of the risk. • Determining the Annual Rate of Occurrence(ARO): ARO is the number of times that you reasonably expect the risk to occur during one year. • Determining Annual Loss Expectance(ALE): The ALE is the total amount of money that your organization will lose in one year if nothing is done to mitigate the risk. • Determining Cost of Controls: requires accurate estimates on how much acquiring, testing, deploying, operating, and maintaining each control would cost. • Return on security Investment: ROSI = ALE before control – ALE after control – annual cost of controls. • The results of the quantitative Risk analyses: --Assigned monetary values for asset -- A comprehensive list of significant threats -- The probability of each threat occurring -- The loss potential for the company on a per-threat basis over 12 months. -- Recommended safeguards, control, and actions.
Approaches to Risk Prioritization -- Qualitative Risk Management • The basic process is very similar to what happens in the quantitative approach. • The difference is in the details: -- You calculate relative values not assign hard financial values to assets, expected losses, and cost of controls. -- Risk analysis is usually conducted through a combination of questionnaires and collaborative workshops involving people from a variety of groups within the organization; • The results are presented to management for consideration during a cost-benefit analysis.
Microsoft Security Risk Management Process • Is a hybrid approach that joins the best elements of the 2 traditional approaches. • Significantly simpler than traditional quantitative risk management. • Minimize resistance to results of the risk analysis and decision support phases. • Enabling consensus to be achieved more quickly and maintained throughout the process.
Determining Risk Management Maturity Level • There are 6 levels -- 0 non existed. -- 1 Ad Hoc -- 2 Repeatable -- 3 Defined Process -- 4 Managed -- 5 Optimized • Self assessment: given a questions list, for each question, score your organization from 0 to 5 based on the definition, then add all of the score together. >= 52. The organization is well prepared to introduce and use the Microsoft security risk management process to its fullest extent. 34—50 indicates the organization has taken many significant steps to control security risks and is ready to gradually introduce the process. < 34 should consider starting very slowly with the Microsoft security risk management process by creating the core security risk management team and applying the process to a single business unit for the first few months.
Assessing Risk -- Identify and prioritize risks to the business • Planning —Building the foundation for a successful risk assessment. • Facilitated data gathering — Collecting risk information through facilitated risk discussions. • Risk prioritization — Ranking identified risks in a consistent and repeatable process.
Assessing Risk -- Planning • Alignment:Proper timing aids in building consensus during the assessment because it allows stakeholders to take active roles in the planning process. Proper alignment of the risk management process with the budget planning cycle also benefit internal and external auditing activities. • Scope: the risk assessment scope should document all organization functions included in the risk assessment. • Stakeholder Acceptance: A best practice to enlist stakeholder support is to pre-sell the concept and the activities within the risk assessment • Preparing for success: Setting reasonable expectations is critical if the risk assessment is to be successful. • Embracing Subjectivity
Facilitated Data Gathering • Keys to success: Building support; Discussing vs. Interrogating; Building Goodwill • Risk Discussion Preparation: -- Identify Risk Assessment Inputs -- Identify and classifying Assets -- Organizing Risk Information -- Organizing by Defense-in-Depth Layers -- Defining Threats and Vulnerabilities -- Estimating Asset Exposure -- Estimating Probability of Threats • Facilitating Risk Discussions
Prioritize risks • Primary Tasks and Deliverables -- Task One: Build the summary level list using broad categorizations to estimate probability of impact to the organization. Output: Summary level list to quickly identify priority risks to the organization. -- Task Two: Review summary level list with stakeholders to begin building consensus on priority risks and to select the risks for the detailed level list. -- Task three: Build the detailed level list by examining detailed attributes of the risk in the current business environment. This includes guidance to determine a quantitative estimate for each risk. Output: Detailed level list providing a close look at the top risks to the organization. • Conducting Summary Level Risk Prioritization -- Task one – Determine impact value from impact statements collected in the data gathering process. -- Task two – Estimate the probability of the impact for the summary level list. -- Task Three – Complete the summary level list by combining the impact and probability values for each risk statement. • Reviewing with stakeholders • Building detailed level list of risks. -- Determine impact and exposure; -- Identify current controls -- Determine probability of impact; -- Determine detailed risk level • Quantifying Risks -- Assign a monetary value to each asset class for your organization -- Input the asset value for each risk; --Produce the single loss expectancy value -- Determine the annual Rate of occurrence; --Determine the annual loss expectancy.
Conducting Decision Support • Define functional requirements. • Select control solutions. • Review solutions against the requirements. • Estimate the degree of risk reduction that each control provides. • Estimate costs of each solution. • Select the risk mitigation strategy.
Implementing Controls and Measuring Program Effectiveness • Implementing Controls phase -- Deploy and operate control solutions to reduce risk to the business. -- Seek holistic approach – Incorporate people, process, and technology in mitigation solution. -- Organize by defense-in-depth – Organize mitigation solutions across the business. • Measuring Program Effectiveness phase -- is an ongoing one in which the Security Risk Management Team periodically verifies that the controls implemented during the preceding phase are actually providing the expected degree of protection. -- Analyze the risk management process for effectiveness and verify that controls are providing the expected degree of protection. -- Evaluate the risk management program for opportunities to improve. -- Develop risk scorecard – Understand risk posture and progress.
