DevSecOps FAQ: Top Questions

Threat modeling is a structured approach to identifying, evaluating, and mitigating potential security threats to a system or application. In DevSecOps, it shifts security left by helping teams anticipate threats early during design and planning phases.

🗺️ Step-by-Step Instructions:

1. Define Scope: Identify what system, component, or feature you’re modeling.
2. Create Architecture Diagrams: Draw data flow diagrams (DFDs) showing processes, data stores, and trust boundaries.
3. Identify Threats: Use frameworks like STRIDE (Spoofing, Tampering, Repudiation, Information Disclosure, Denial of Service, Elevation of Privilege).
4. Rate Risks: Apply risk scoring models such as DREAD or CVSS to prioritize issues.
5. Propose Mitigations: Suggest countermeasures to eliminate or reduce threats.
6. Document and Revisit: Capture findings in threat models and revisit them periodically or after major changes.

📥 Example Input:

System: Web login service
DFD Elements:
- User Browser → Web Server
- Web Server → Auth DB
Trust Boundary: Internet ↔ Web Server

🏆 Expected Output:

Identified Threat: Spoofing (unauthorized access to login endpoint)
Mitigation: Implement Multi-Factor Authentication (MFA) and rate limiting

✅ DevSecOps Solution:

# Using OWASP Threat Dragon
Install or launch: https://owasp.org/www-project-threat-dragon/
Draw DFD → Apply STRIDE → Export report

📘 Detailed Explanation:

• Proactive Security: Helps foresee vulnerabilities before writing code.
• Cross-Functional Collaboration: Involves developers, architects, security, and ops in unified design reviews.
• Living Document: Keeps security requirements updated as the system evolves.

🛠️ Use Cases:

• Analyzing new features like payments, authentication, or APIs for potential threats.
• Enhancing security during system redesign or cloud migration.
• Aligning architecture reviews with compliance initiatives (e.g., SOC 2, PCI-DSS).