Shared Responsibility Model: Where Your Cloud Provider's Security Ends

One of the most persistent misunderstandings Innovo Networks encounters among South African businesses is the assumption that moving to a major cloud provider means that provider is fully responsible for security. It's a costly misconception and understanding exactly where that responsibility splits is essential to avoiding preventable incidents.

What the Shared Responsibility Model Actually Says

Major cloud providers — AWS, Microsoft Azure, Google Cloud — operate under a shared responsibility model, typically summarized as the provider being responsible for security of the cloud, while the customer remains responsible for security in the cloud.

In practice, this means the cloud provider secures the underlying physical infrastructure, data centers, and core platform services. The customer remains responsible for how they configure and use those services — access control, data classification, encryption settings, network configuration, and application-level security.

Where This Gets Misunderstood

Many organizations assume that because AWS or Azure has world-class physical security and infrastructure resilience, their data is inherently protected. This overlooks the reality that the vast majority of cloud security incidents stem from customer-side misconfiguration — a publicly exposed storage bucket, an overly permissive access policy, unencrypted data — not a failure of the provider's underlying infrastructure.

Responsibility Shifts Depending on Service Model

The split of responsibility also shifts depending on what type of cloud service is being used:

• Infrastructure as a Service (IaaS) places the most responsibility on the customer, covering everything from the operating system upward, including patching, configuration, and access control.
• Platform as a Service (PaaS) shifts more responsibility to the provider, though customers remain responsible for application-level security and data protection.
• Software as a Service (SaaS) places the least technical responsibility on the customer, but data classification, access management, and configuration of sharing and permission settings typically remain the customer's responsibility.

Why This Matters for SA Businesses Specifically

Given POPIA's requirement for organizations to implement appropriate technical and organizational measures, misunderstanding the shared responsibility model can leave a significant compliance gap — believing a cloud provider's infrastructure security satisfies obligations that depend on the customer's own configuration choices.

Practical Steps to Close the Gap

• Explicitly document what your organization is responsible for under each cloud service you use, rather than assuming.
• Review provider-published shared responsibility documentation for each specific service, since the split can vary even within the same provider's ecosystem.
• Implement CSPM tooling to continuously validate that your side of the responsibility split is being met, rather than assuming configurations remain secure over time.
• Train relevant staff — not just security teams, but developers and IT administrators provisioning cloud resources — on what falls under customer responsibility.

Innovo Networks' Approach

We help SA organizations map exactly where their responsibility begins across every cloud service in use, and implement the visibility and controls needed to meet that responsibility on an ongoing basis. A secure cloud provider doesn't automatically mean a secure cloud environment — that outcome depends on what happens on your side of the line.