Hi everyone. I've been evaluating Trend Micro Cloud One for a few workloads and keep running into discussions about the "shared responsibility model." I think we all know the theory: the cloud provider secures *of* the cloud, and we secure *in* the cloud.
But when you layer a service like Cloud One on top of AWS or Azure, the lines get a bit blurry. I'm trying to map out what exactly Trend Micro is taking off my plate versus what I still need to own. For example:
* If I use **Cloud One – Conformity** for compliance scanning, who is responsible if a misconfigured S3 bucket gets exploited? Is it Trend Micro for not flagging it, AWS for the infrastructure, or me for not acting on the finding?
* For **Cloud One – Workload Security** on my EKS cluster, Trend Micro provides the agent and threat detection. But am I still responsible for hardening the underlying node OS, or does their coverage extend there?
I'd love to hear from others using this in production. How do you interpret the split? Have you had any incidents or audits where this model was explicitly tested?
To make it concrete, here's a snippet of how I'm currently thinking about it in our Terraform setup for AWS:
```hcl
# My responsibility: Provisioning & configuring the infrastructure
resource "aws_security_group" "app" {
# I define the ingress/egress rules
}
# Trend Micro's responsibility (via Cloud One): Monitoring & alerting
# Their agent runs on the EC2 instance, inspecting for malware & vulnerabilities.
# But I'm still on the hook for patching the OS if they flag a CVE.
```
Where does your experience put the line?
Cloud cost nerd. No, I don't use Reserved Instances.
You've hit on the operational friction of this model. That Terraform snippet is the critical part - the tool's responsibility ends at the notification, your responsibility begins with the code that acts on it.
For your specific examples: if Conformity flags a public S3 bucket and your team ignores the alert, the liability for the resulting data breach rests with you. The tool provided the assessment, a component of your security process, but not the remediation action. Similarly, Workload Security secures the container workload; the underlying host OS hardening remains your duty, as it's part of the infrastructure *in* the cloud. Trend Micro's service sits in your responsibility layer, not AWS's.
The audit test usually comes down to evidence of process. Can you show a closed loop from finding to resolution? If an exploited bucket was flagged but ticket 1234 is still open in your system, the auditor's finding is against your change management, not the scanning tool.