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So, as I am preparing a service description for a SOC-2 audit (the first). I have a question. Is a cloud service provider considered a subservice organization? I have seen a few things that indicate it is, while I personally feel it is a vendor, like Dell or IBM for servers, Microsoft or Red Hat for an operating system, etc. Any guidance from experience?
Good question. There is no silver bullet answer to this and there is judgment and different interpretations of the standards. I will provide you my stance as an auditor that performs SOC 2 audits.
The key to determining if a CSP is a SOC 2 subservice provider, is if you are relying on the vendor to perform a control and without the control, you would not be meeting a specific SOC 2 requirement. For instance, if you are using a CSP such as AWS and Azure to host the services you provide to customers, they would be a subservice provider, since you cannot meet the requirement for physical security without relying on AWS and Azure. However, if you are using a CSP for tracking changes and software development, this vendor would not be a subservice provider since you are not relying on them for specific controls.
Keep in mind, regardless of whether or not you determine if the vendor is a subservice provider, you are still responsible for monitoring key vendors. In this instance, you should have a vendor management program where key vendors are monitored on a regular basis, subservice orgs and non-subservice orgs.