Threat modeling the Kubernetes Agent: from MVC to continuous improvement

Threat modeling is a regular, intuitive process that occurs in daily life, akin to assessing risks before crossing a street. At GitLab, this concept has been formalized into a robust process, evolving from a basic security assessment to a comprehensive threat modeling framework since November 2020, initially applied to GitLab's Kubernetes Agent beta. Over time, the framework has matured through iterations, incorporating detailed data flow diagrams, application decomposition, and structured threat analysis sections, leading to improved security assessments and cross-organizational feedback. This iterative process has seen the Kubernetes Agent's architecture evolve, revealing new threats and refining security measures such as the use of JWT tokens and secure communications. GitLab aims to expand threat modeling across its engineering teams for better asynchronous communication and early integration of security practices. Future plans include sharing threat models publicly and exploring methodologies like PASTA for deeper insights, while additional resources on Kubernetes threat modeling are available for those interested in specific details or methods.

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