Software Development Security in ISO 27799

This curriculum spans the equivalent of a multi-workshop program, guiding teams through the integration of ISO 27799 controls across the software development lifecycle, from secure coding and access governance to audit preparation and incident response, as applied in regulated health information environments.

Module 1: Aligning Software Development Security with ISO 27799 Controls

• Map software development lifecycle (SDLC) phases to ISO 27799 control objectives, such as A.12.1.2 (Control of Operational Software) and A.14.2.8 (Secure Development Environment).
• Integrate ISO 27799’s risk-based approach into threat modeling activities during system design.
• Establish traceability between security requirements and specific ISO 27799 controls to support audit readiness.
• Adapt control implementation depth based on the sensitivity of health information processed, as defined in ISO 27799’s context.
• Define roles and responsibilities for development teams in enforcing controls like A.7.4.1 (Clear Desk Policy) within development environments.
• Document exceptions to control implementation with formal risk acceptance processes aligned to organizational risk appetite.
• Coordinate with privacy officers to ensure software controls support both ISO 27799 and HIPAA or GDPR requirements.
• Use control mapping to prioritize security activities in agile sprints without compromising compliance scope.

Module 2: Secure Development Lifecycle Integration

• Embed security gates at each SDLC phase, requiring evidence of control implementation before progression.
• Define mandatory security artifacts (e.g., threat models, data flow diagrams) for inclusion in sprint deliverables.
• Enforce static application security testing (SAST) execution prior to merge requests in CI/CD pipelines.
• Require security sign-off from designated reviewers before production deployment.
• Integrate dynamic application security testing (DAST) into staging environments with automated result reporting.
• Implement software composition analysis (SCA) to detect and block use of vulnerable open-source components.
• Define and enforce secure coding standards based on OWASP Top 10 and ISO 27799 guidance.
• Track security debt alongside technical debt in backlog management tools for visibility and prioritization.

Module 3: Access Control and Privilege Management in Development

• Restrict access to source code repositories based on role and need-to-know, aligned with ISO 27799 A.9.2.3.
• Enforce multi-factor authentication for access to production and pre-production environments.
• Implement just-in-time (JIT) access for administrative privileges in development and testing platforms.
• Segregate duties between developers, testers, and deployment operators to prevent unauthorized changes.
• Automate deprovisioning of access upon role change or project completion using identity lifecycle workflows.
• Log and monitor privileged actions in development environments for anomaly detection.
• Apply least privilege principles to service accounts used in CI/CD pipelines.
• Conduct quarterly access reviews for development and test environments with documented outcomes.

Module 4: Secure Configuration of Development and Deployment Environments

• Enforce use of hardened base images for containers in development and staging environments.
• Standardize configuration templates for development workstations to prevent insecure defaults.
• Disable unnecessary services and ports in test environments to reduce attack surface.
• Automate configuration compliance checks using tools like Ansible or Chef InSpec.
• Isolate development environments from production networks using VLANs or micro-segmentation.
• Prohibit use of production data in development without anonymization or tokenization.
• Implement centralized logging for all development infrastructure with retention aligned to policy.
• Enforce encryption of data at rest and in transit across all non-production environments.

Module 5: Third-Party and Supply Chain Risk in Software Development

• Require security questionnaires and ISO 27799 alignment verification for third-party software vendors.
• Conduct code audits or require access to SAST/DAST reports for purchased or outsourced components.
• Define contractual obligations for vulnerability disclosure and patch timelines with suppliers.
• Restrict use of third-party libraries to those with active maintenance and known security posture.
• Implement automated monitoring for newly disclosed vulnerabilities in dependencies.
• Prohibit use of unsigned or unverified packages in build pipelines.
• Establish a software bill of materials (SBOM) requirement for all externally developed modules.
• Perform due diligence on offshore development partners, including physical and personnel security practices.

Module 6: Incident Response and Security Monitoring for Development Teams

• Integrate development environments into enterprise SIEM with standardized log formats.
• Define playbooks for responding to source code leaks or unauthorized access to repositories.
• Conduct tabletop exercises involving developers for incidents involving compromised build systems.
• Establish alerting thresholds for anomalous behavior in CI/CD pipelines (e.g., off-hours deployments).
• Preserve forensic artifacts from build and deployment systems for post-incident analysis.
• Assign development team members to incident response rotations with defined escalation paths.
• Log all changes to infrastructure-as-code (IaC) templates and trigger alerts on unauthorized modifications.
• Coordinate with SOC to tune detection rules for developer-specific attack patterns (e.g., dependency hijacking).

Module 7: Security Testing and Assurance Activities

• Define minimum coverage thresholds for SAST, DAST, and SCA tools in each release cycle.
• Conduct manual penetration testing for high-risk applications prior to deployment.
• Validate security fixes through retesting and proof-of-patch verification.
• Integrate security test results into release decision dashboards accessible to governance teams.
• Perform configuration drift testing between environments to detect insecure deviations.
• Use threat modeling outputs to guide penetration testing scope and test case development.
• Establish criteria for accepting vulnerabilities based on exploitability and compensating controls.
• Archive test reports and evidence for audit and regulatory review cycles.

Module 8: Change and Release Management Governance

• Enforce use of change advisory boards (CAB) for production deployments involving health data.
• Require rollback plans and backout procedures for every release package.
• Automate deployment approvals based on completion of security testing gates.
• Track emergency changes with post-implementation review requirements.
• Implement version control for all deployment scripts and infrastructure configurations.
• Log all deployment activities with immutable audit trails accessible to auditors.
• Restrict direct deployment to production; require promotion through staging environments.
• Enforce deployment freeze periods during critical clinical operations or audits.

Module 9: Audit, Compliance, and Continuous Improvement

• Prepare development artifacts for internal and external audits, including evidence of control implementation.
• Conduct internal control assessments using ISO 27799 checklists tailored to software projects.
• Map findings from audits to corrective action plans with development team ownership.
• Use key risk indicators (KRIs) such as open vulnerability aging and failed security gates to monitor program health.
• Update secure development policies based on changes to ISO 27799 or regulatory requirements.
• Perform root cause analysis on recurring security defects to improve SDLC processes.
• Benchmark security practices against industry standards and adjust controls accordingly.
• Integrate feedback from post-deployment incidents into SDLC control enhancements.