I am currently preparing for my CCSP certification and I am getting a bit confused about the Shared Responsibility Model. If our company is using a mix of AWS for hosting and a third-party SaaS for CRM, who is ultimately liable if a data breach occurs due to an unpatched operating system versus a misconfigured S3 bucket? It seems like a gray area when you scale across different vendors and service models.
3 answers
The Shared Responsibility Model is the cornerstone of cloud security, but it changes based on the service type (IaaS, PaaS, or SaaS). For an unpatched OS in an IaaS environment like AWS EC2, the responsibility lies entirely with your organization. However, for a SaaS platform, the provider manages the underlying infrastructure and OS patching. A misconfigured S3 bucket is almost always the customer's fault due to improper IAM policies or public access settings. Always consult your provider's specific Service Level Agreement (SLA) to define these boundaries clearly for your security audits.
This is a great point, but have you considered how this model shifts when you introduce serverless functions like AWS Lambda? In that case, does the provider handle more of the runtime security, or are we still on the hook for the application code vulnerabilities?
In short, the provider secures the "Cloud" (physical hardware and virtualization), while you secure what is "In the Cloud" (data, apps, and access).
Spot on! Most people forget that the provider can't protect you from your own weak passwords or poorly configured firewall rules.
For serverless environments, the provider manages the underlying server and runtime environment, but you remain strictly responsible for the security of your code and the data it processes. You must ensure your IAM roles follow the principle of least privilege so the function cannot be exploited to access other cloud resources.