B1_Chapter 2.pdf - Managing Software Security Risks...

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Managing Software Security Risks Building Secure Software Chapter 2 1
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An Overview of Software Risk Management for Security The most important prerequisite to software risk management is adopting a high-quality software engineering methodology that enables good risk management practices. 2
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An Overview of Software Risk Management for Security Rapid application development Waterfall 3
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The Role of Security Personnel Approaching security as risk management may not come easily to some organizations. One of the problems encountered in the real world involves the disconnect between developers and the security staff of the information technology (IT) department. One workable approach to bridging the gap is to make software security somebody’s job. Two major qualifications are required for a software security lead: (1) a deep understanding of software development (2) an understanding of security. Of these two, the first qualification is probably the most important. 4
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The Role of Security Personnel A software security practitioner needs to know about security as well. Identifying security risks (and other software risks for that matter) requires experience with real risks in the real world. Once a software security lead has been identified, he or she should be the primary security resource for developers and architects. For example, it’s good practice to provide a set of implementation guidelines for developers to keep in mind. 5
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Software Security Personnel in the Life Cycle Another job for the software security lead is that he or she should be responsible for making sure security is fairly represented during each phase of the software engineering life cycle. Deriving Requirements: In developing a set of security requirements, the engineer should focus on identifying: what needs to be protected from whom those things need to be protected and for how long protection is needed Also, one should identify how much it is worth to keep important data protected 6
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Deriving Requirements After this exercise, the engineer will most likely have identified a large number of the most important security requirements. The security engineer should be sure to craft requirements well. For example , the requirement “This application should use cryptography wherever necessary” is a poor one. because it prescribes a solution without even diagnosing the problem. The goal of the requirements document is not only to communicate what the system must do and must not do, but also to communicate why the system should behave in the manner described. A much better requirement in this example would be, “Credit card numbers should be protected against potential eavesdropping because they are sensitive information.” The choice of how to protect the information can safely be deferred until the system is specified.
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