Security doesn’t disappear when you move to the cloud. It changes. Cloud providers take care of part of it, but your team still owns a significant share. This division is called the shared responsibility model.
The provider secures the infrastructure, while you secure your data and applications. Knowing this boundary is critical. If you assume the provider handles more than they actually do, gaps appear quickly.
How The Model Changes Across Cloud Services
Responsibility depends on the service you use, and each model divides it differently.
Infrastructure as a Service (IaaS)
The provider manages the physical infrastructure, such as servers, storage, and networking. Your team handles everything on top of it.
You are responsible for:
- Operating system security and patching
- Applications and workloads
- Data protection
- System configurations
This model offers flexibility but requires strong internal security practices.
Platform as a Service (PaaS)
The provider manages infrastructure along with the operating system and middleware. Your focus shifts more toward applications.
You are responsible for:
- Application security
- Data protection
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This reduces operational effort, but secure coding and data handling remain essential.
Software as a Service (SaaS)
The application and the entire stack are managed by the provider.
You are responsible for:
- Data usage and protection
- User access and identity management
Even in SaaS, poor access control can create serious risks.
Why responsibility is not always clear
The model seems simple, but details vary by provider and service, especially for infrastructure and operations.
This becomes more challenging in multi-cloud environments. Each platform may follow a slightly different model, and even a small misconfiguration in one system can affect the entire environment. Your overall security is only as strong as your weakest point.
What You Always Own in the Cloud
No matter which service model you use, some responsibilities always remain with you.
Data and information
You control your data completely. This covers how data is stored, accessed, and shared. Providers don’t manage their visibility or governance.
Applications and code
Your applications remain your responsibility throughout their lifecycle.
This includes:
- Securing code repositories
- Testing during development
- Managing production access
- Protecting integrations
Identity and access management
You are fully responsible for managing user access.
This includes:
- Authentication and authorization
- Single sign-on and multi-factor authentication
- User roles and permissions
- Passwords, keys, and certificates
Configuration of resources
You control how your cloud environment is set up.
- In server-based environments, you handle OS hardening, patching, and application security.
- In serverless or managed environments, you configure access and permissions through the provider’s control plane
Connected systems and monitoring
Your responsibility extends beyond the cloud itself.
You must secure:
- On premises systems
- User devices
- Networks and communication layers
You also need to set up monitoring and alerting for these areas.
The Gray Areas You Need to Understand
Some responsibilities depend on how your environment is built, especially in IaaS.
In server-based setups, you often manage:
- Identity directories such as Active Directory or LDAP
- Applications and workloads
- Network configurations above the virtualization layer
- Operating systems and updates
In PaaS and serverless environments, the provider takes on more of this work. However, you still configure access and ensure secure usage.
Less control does not mean less responsibility. It simply shifts where your focus should be.
What Cloud Providers Are Responsible For
Cloud providers take full ownership of certain layers. This is where much of the operational burden is reduced.
They handle:
- Virtualization layer that isolates workloads
- Data centers, servers, and networks
- Physical security, redundancy, and disaster recovery
It secures the foundation, but not your misconfigurations or weak access controls.
How This Works in Real Environments
Shared responsibility does not mean shared control over the same task. Each side owns its domain completely.
- You control how your applications, data, and access are secured
- The provider controls how infrastructure and hardware are secured
You can review provider audit reports to verify their security standards, but you cannot influence how they implement them.
Impact On Developers and DevOps Teams
Cloud environments make it easy to create and scale resources quickly. This improves speed but increases risk.
Misconfigurations are a leading cause of cloud security failures. Development and test environments can expose sensitive systems if not properly secured.
To reduce risk:
- Enforce strict access controls
- Use centralized and policy-driven provisioning
- Monitor development environments closely
Securing The DevOps Pipeline
Your team is responsible for securing the tools and processes used to deliver applications.
This includes:
- Code repositories
- Container registries
- Build and orchestration tools
Security should be integrated early in the development process. Automated testing catches issues before production.
Managing Configuration and Change Risks
Cloud environments allow rapid changes, which can introduce risk if not controlled.
To manage this effectively:
- Use policy-based controls for provisioning
- Automate workflows where possible
- Continuously monitor configurations
Security and operations teams need to work together to maintain control without slowing down innovation.
Compliance, Visibility, And Threat Management
Even when providers handle infrastructure, compliance remains your responsibility. You must ensure that your systems meet internal and regulatory requirements.
Maintaining visibility is key. This includes:
- Monitoring across cloud and on premises systems
- Detecting and responding to threats
- Using centralized CNAPP platforms for analysis and response
Strong visibility helps maintain a consistent security posture.
Cloud Security Best Practices
A few core practices can help you stay secure in the cloud:
- Define clear security roles
- Run regular audits and risk checks
- Train teams on security
- Use controls like encryption and firewalls
- Monitor for threats continuously
- Maintain a clear incident response plan
These steps help reduce gaps and ensure accountability.
Final Thoughts
The shared responsibility model is key to cloud security. Providers handle infrastructure, but you still have major responsibilities.
Most risks come from misconfigurations, weak access, and unsecured apps. Understanding and managing your role keeps your environment secure.
When responsibilities are clear, you can use the cloud without added risk. Platforms like Fidelis Halo®, a CNAPP, help provide the visibility and control needed to manage them effectively.
