ISO 27001 Separation of Duties: Preventing Single Points of Failure

The build froze. A single wrong permission had let one engineer push code and approve it. Nobody saw the flaw until production burned.

ISO 27001 calls this out as a control: Separation of Duties. It means no single person should have unchecked power over a process. One writes the code, another reviews, a third deploys. This reduces risk, stops fraud, and catches mistakes before they ship.

Under ISO 27001, Separation of Duties falls within Annex A.9 and A.6. It’s tied to access control and role assignment. You define responsibilities, then enforce them with technical and procedural rules. This is not just policy on paper. It is applied through permissions, source control rules, CI/CD pipelines, and account segregation.

Separation of Duties works best when roles are crystal-clear. No overlap that allows bypass. Developers have dev access, not production keys. Reviewers cannot push without a second check. Admins cannot approve their own changes. Every significant action has an independent verifier.

Implementation steps under ISO 27001 include:

• Mapping all critical processes.
• Documenting who can perform each task.
• Applying least privilege principles.
• Using identity and access management to enforce constraints.
• Auditing logs to confirm compliance.

The standard requires evidence. Schedule regular reviews. Track every access change. Lock unused accounts. Automate enforcement where possible. Tools can link role assignment to workflow, making violations impossible by design.

Neglecting Separation of Duties invites insider threats and accidental damage. Proper controls align with ISO 27001’s emphasis on information security and resilience. It is a direct way to reduce points of failure and ensure operational integrity.

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