Write unit and integration tests to validate that all critical flowsĪre resistant to the threat model. Integrate plausibility checks at each tier of your application Integrate security language and controls into user stories Use threat modeling for critical authentication, access control, Professionals to help evaluate and design security andĮstablish and use a library of secure design patterns or paved road How to PreventĮstablish and use a secure development lifecycle with AppSec Consider leveraging the OWASP Software Assurance Maturity Model (SAMM) to help structure your secure software development efforts. Reach out for your security specialists at the beginning of a software project throughout the whole project and maintenance of your software. Secure software requires a secure development lifecycle, some form of secure design pattern, paved road methodology, secured component library, tooling, and threat modeling. Secure design is neither an add-on nor a tool that you can add to software. Learn from mistakes and offer positive incentives to promote improvements. Ensure the results are documented in the user story. Determine how to validate the assumptions and enforce conditions needed for proper behaviors. Analyze assumptions and conditions for expected and failure flows, ensure they are still accurate and desirable. In the user story development determine the correct flow and failure states, ensure they are well understood and agreed upon by responsible and impacted parties. Threat modeling should be integrated into refinement sessions (or similar activities) look for changes in data flows and access control or other security controls. Secure design is a culture and methodology that constantly evaluates threats and ensures that code is robustly designed and tested to prevent known attack methods. Plan and negotiate the budget covering all design, build, testing, and operation, including security activities. Compile the technical requirements, including functional and non-functional security requirements. Take into account how exposed your application will be and if you need segregation of tenants (additionally to access control). Requirements and Resource ManagementĬollect and negotiate the business requirements for an application with the business, including the protection requirements concerning confidentiality, integrity, availability, and authenticity of all data assets and the expected business logic. One of the factors that contribute to insecure design is the lack of business risk profiling inherent in the software or system being developed, and thus the failure to determine what level of security design is required. An insecure design cannot be fixed by a perfect implementation as by definition, needed security controls were never created to defend against specific attacks. A secure design can still have implementation defects leading to vulnerabilities that may be exploited. We differentiate between design flaws and implementation defects for a reason, they have different root causes and remediation. There is a difference between insecure design and insecure implementation. Insecure design is a broad category representing different weaknesses, expressed as “missing or ineffective control design.” Insecure design is not the source for all other Top 10 risk categories. Notable Common Weakness Enumerations (CWEs) include CWE-209: Generation of Error Message Containing Sensitive Information, CWE-256: Unprotected Storage of Credentials, CWE-501: Trust Boundary Violation, and CWE-522: Insufficiently Protected Credentials. As a community we need to move beyond "shift-left" in the coding space to pre-code activities that are critical for the principles of Secure by Design. A04:2021 – Insecure Design Factors CWEs MappedĪ new category for 2021 focuses on risks related to design and architectural flaws, with a call for more use of threat modeling, secure design patterns, and reference architectures.
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