Establish threat modeling for pipelines, IaC, and deployment architectures
Implementation Effort: High – Building a repeatable threat modeling practice and applying it across pipelines, IaC, and deployment designs is an ongoing commitment for security and engineering teams. User Impact: Low – Threat modeling design reviews are run by developers and security engineers; end users are not affected. Lifecycle Stage: Code
Overview
Establish a threat modeling practice for pipelines, infrastructure as code, and deployment architectures so teams can identify design-level risks before changes reach production.
Automated security scanning catches known vulnerability patterns, but it cannot reason about design-level flaws — a pipeline that grants a deployment identity too much access, an infrastructure-as-code template that places a database on a public subnet by design, or a CI workflow that allows self-hosted runners to process untrusted pull request code. These architectural weaknesses are invisible to static analysis tools and only become apparent when someone deliberately asks how a threat actor could abuse the design. Without threat modeling, organizations discover these flaws only after they have been exploited or flagged by a penetration test, both of which are expensive and late in the lifecycle.
Threat modeling should be applied to the DevSecOps components that have the most direct path to production. Using Microsoft's Threat Modeling Tool or the STRIDE methodology, a small group of developers and security engineers can identify how each component could be spoofed, tampered with, or abused for privilege escalation. Key areas to model include pipeline trigger and approval flows, secret injection and credential scope, runner and agent trust boundaries, infrastructure-as-code module inputs and network boundaries, container image provenance chains, and deployment identity permissions.
Threats and mitigations should be documented alongside the design and revisited whenever pipeline architectures, trust relationships, or deployment targets change. This supports Verify explicitly because the threat model forces teams to articulate and validate every trust assumption in a pipeline or infrastructure-as-code design, rather than accepting those assumptions implicitly.