From DevOps to DevSecOps: Understanding Threats, Security Practices, and Using Microsoft Threat Modeling Tool

DevOps originally emphasized collaboration between development and operations, but modern software delivery requires security to be woven into every stage of the lifecycle, giving rise to DevSecOps – the integration of development, security, and operations.

Traditional security practices added security checks late in the process, creating bottlenecks and high remediation costs. DevSecOps shifts security left, enabling continuous security testing, automated remediation, and shared responsibility among developers, security engineers, and IT operators.

The article highlights two major threat categories: injection attacks (e.g., SQL injection) and broken access control, citing real‑world incidents such as the 2008 Ohio State University breach, the 2011 Sony PlayStation hack, and the 2015 TalkTalk data leak. It also references OWASP Top 10 2017 and 2021 rankings, noting the rise of broken access control to the top position.

To address these risks, the Security Development Lifecycle (SDL) is introduced, covering phases from requirements and design through testing, deployment, and post‑incident review. Early identification of vulnerabilities reduces cost and prevents the accumulation of security debt.

The article then provides a practical guide to using the Microsoft Threat Modeling Tool:

Download and install the tool from https://aka.ms/threatmodelingtool .

Launch the tool and create a new model.

Add Azure resources such as an App Service Web App and Azure SQL Database, linking them to visualize request/response flows.

Switch to the Analysis view to see threats categorized by severity.

Generate a full threat report via the Report → Create Full Report menu.

Use the tool’s mitigation categories (based on the Web Application Security Framework) to prioritize fixes and track remediation.

Threat modeling follows five steps: define security requirements, create an application relationship diagram, identify threats, mitigate threats, and verify mitigations. The STRIDE model (Spoofing, Tampering, Repudiation, Information disclosure, Denial of service, Elevation of privilege) is used to classify threats.

Finally, the article promotes a DevOps/DevSecOps certification program, encouraging readers to enroll and apply the discussed practices in real projects.