Getting an Authority to Operate (ATO) for AWS FedRAMP can cost more than $3 million in labor and tooling. The process takes 12-18 months from start to authorization, and some organizations need over 24 months to finish it.
The biggest challenge lies in FedRAMP High compliance. Organizations must follow 421 security controls spread across 17 different control families. You can reduce this burden by a lot through strategic control inheritance. Organizations that use AWS services in AWS GovCloud (US) Regions have already inherited over 46 FedRAMP-required security controls. This speeds up their compliance process.
AWS meets infrastructure compliance standards like FedRAMP. The platform ensures high resilience through its globally distributed architectures and strict surveillance. This shared responsibility model creates the foundations of a FedRAMP-compliant environment that meets security requirements right from the start.
This piece will show you ways to make the most of control inheritance and reduce your NIST 800-53 workload. The government has already verified that a data center’s physical security meets NIST standards. Every system in that data center should benefit from this verification. We’ll guide you through building a secure, adaptable AWS FedRAMP environment that cuts costs and speeds up your authorization timeline.
Understanding AWS FedRAMP Inheritance and Shared Responsibility
Image Source: AWS
The Federal Risk and Authorization Management Program (FedRAMP) are the foundations of secure cloud adoption in federal agencies. This government-wide initiative started in 2011 and provides a standard approach to security assessment, authorization, and continuous monitoring for cloud services. FedRAMP stands out from traditional compliance frameworks by focusing on reusability. This lets agencies use existing security assessments instead of starting from scratch.
What is FedRAMP and why it matters for AWS customers
FedRAMP acts as the government’s cloud security gatekeeper to ensure federal information stays protected in cloud environments. The program builds trust in cloud solutions through NIST standards. It makes government-provider relationships more transparent, offers real-time monitoring, and speeds up secure cloud adoption by reusing assessments.
FedRAMP certification is crucial for AWS customers. Federal agencies must use the FedRAMP process for cloud service assessments and authorizations. AWS GovCloud Regions meet FedRAMP High baseline requirements and support workloads up to Department of Defense Security Requirements Guide – Impact Level 5. Government agencies can now adopt AWS cloud technologies with confidence while meeting strict security standards.
FedRAMP High baseline is the most demanding security tier. It handles the government’s most sensitive unclassified data and needs 421 security controls across 17 control families. Organizations can reduce their workload through proper inheritance strategies.
AWS Shared Responsibility Model in the context of FedRAMP
AWS Shared Responsibility Model splits security duties between AWS and its customers. AWS handles security “of the cloud” – the infrastructure running services including hardware, software, networking, and facilities. Customers take care of security “in the cloud” – their content, applications, identity management, and configuration.
This split applies to FedRAMP compliance controls too. Controls come in three types:
- Inherited Controls: AWS manages these fully, like physical and environmental protections. Customers get these automatically.
- Shared Controls: These apply to both infrastructure and customer environments differently. AWS handles infrastructure patches while customers manage guest OS updates. AWS maintains infrastructure devices while customers configure their applications.
- Customer-Specific Controls: These belong to customers alone, including application-level security and data protection measures.
AWS uses the Customer Responsibility Matrix (CRM) to describe who handles each control requirement. This prevents security gaps.
Inheritance vs. system-specific control implementation
Control inheritance is one of FedRAMP’s best features. Using a FedRAMP-authorized service like AWS GovCloud means customers automatically get security controls AWS has already verified. This eliminates duplicate assessments.
Inheritance works through a documented link between the “providing system” (AWS) and the “receiving system” (customer environment). Customers can inherit entire control families. Maintenance, media protection, and physical/environmental controls usually transfer completely from AWS to customer systems.
Many security features work as shared controls:
- AWS Identity and Access Management (IAM) provides access control compliance
- AWS CloudTrail delivers audit and accountability capabilities
Inheritance beats traditional system-specific setups. Organizations using AWS GovCloud have inherited over 46 FedRAMP-required security controls. This speeds up compliance and removes the need to recreate physical security documentation, policy frameworks, and infrastructure controls AWS has already verified.
Service models determine inheritance levels. Infrastructure as a Service (IaaS) typically allows 20% inheritance, while Platform as a Service (PaaS) can reach 60%+. This varies based on how much technology stack control stays with customers versus providers.
Getting the most from inheritance requires knowing your authorization boundary – the system parts needing assessment. The System Security Plan (SSP) must define this boundary clearly and show how inherited controls meet security requirements.
Mapping Inheritance to the NIST RMF Lifecycle
Image Source: Medium
Mapping inheritance to the NIST Risk Management Framework (RMF) lifecycle needs strategic planning right from the start. The RMF gives organizations a well-laid-out process to get the most out of security control inheritance while staying compliant [link_1]. Here’s how inheritance fits into each phase of this framework.
Prepare: Selecting Common Control Providers (CCPs)
The Prepare step sets the stage to make inheritance work. Organizations must identify and authorize Common Control Providers (CCPs) that give inheritable security capabilities. The Risk Executive needs to create a complete “Common Control Catalog” that shows which controls the enterprise can inherit.
AWS as your CCP requires their Customer Responsibility Matrix (CRM) early in the Prepare phase. This document helps you know your remaining work and shows which controls you can inherit. Picking your cloud provider goes beyond technical aspects – it’s a key compliance decision that can save significant implementation costs.
Categorize: Avoiding the Mismatch Trap
Your system gets a security classification based on what could happen if you lose confidentiality, integrity, or availability. This classification tells you which control baseline (Low, Moderate, High) your system needs.
A “Mismatch Trap” happens when your system needs higher security than its hosting infrastructure provides. A system classified as High but running on AWS infrastructure authorized at Moderate level breaks the inheritance chain. You’ll need extra controls, which cancels out the benefits of inheritance. Make sure AWS GovCloud’s authorization matches or exceeds your system’s security needs.
Select: Identifying Common, Hybrid, and System-Specific Controls
The Select phase marks controls as Common, Hybrid, or System-Specific. AWS handles Common controls fully, while hybrid controls need work from both AWS and your team.
NIST says “The right control implementation approach depends on the context”. Start by reading AWS’s inheritance documentation and ask “What’s already done?” instead of “What do I need?”. This helps you spot which controls you can mark as “Common” based on AWS’s documentation.
Implement: Documenting Inherited Controls
Inheritance really pays off during the Implement step by reducing workload. Inherited controls mainly need documentation. Write down the inheritance relationship clearly (e.g., “Inherited from AWS GovCloud, Authorization Date MM/DD/YYYY”).
For hybrid controls, just do your part as defined in AWS’s CRM. This lets your team focus on system-specific controls for your application logic and business rules. Your team can concentrate on what makes your system special instead of rebuilding security features AWS already provides.
Assess: Using Assessment Reciprocity
Assessment reciprocity becomes key at this stage. The Department of Defense defines it as “the agreement among participating organizations to accept each other’s security assessments”. Your assessor won’t retest controls already verified in AWS’s authorization package.
So if AWS GovCloud handles 70% of your controls, your assessment scope shrinks by that much. This means lower costs and faster authorization.
Authorize and Monitor: Continuous Inheritance Verification
The final phases involve your Authorizing Official (AO) reviewing the authorization package to check if the system’s risk level works. AOs often approve systems on AWS GovCloud more readily because of its existing authorization status and proven track record with federal agencies.
For ongoing monitoring, you just need to watch AWS’s authorization status instead of testing each inherited control. Security improvements in AWS’s infrastructure automatically benefit your system. This shows one of inheritance’s biggest long-term advantages – it cuts ownership costs through simpler monitoring.
Remember, not using inheritance “creates duplicate and resource-heavy work”. Good planning and proper documentation with AWS FedRAMP inheritance can greatly reduce your compliance work throughout the RMF lifecycle.
Using the AWS FedRAMP Customer Responsibility Matrix (CRM)
Image Source: CIS Center for Internet Security
The Customer Responsibility Matrix (CRM) is the life-blood document that helps understand security control implementation between cloud service providers and their customers. Your trip through AWS FedRAMP compliance becomes easier with this document. A good grasp of CRM can make the difference between quick authorization and gaps that get pricey.
How to interpret the CRM for AWS GovCloud
The AWS FedRAMP Customer Responsibility Matrix breaks down control ownership and implementation details. AWS made this document available through AWS Artifact starting September 1, 2023. You can find it as an attachment in the AWS FedRAMP Customer Package. The matrix shows which security controls AWS manages, which ones customers need to implement, and areas where both parties share responsibility.
The AWS GovCloud CRM needs careful attention to specific elements within each control description. The document goes beyond simple “customer” or “AWS” responsibility labels. It gives exact details about control aspects that belong to each party. This detail helps avoid misunderstandings that could create security vulnerabilities.
To access the CRM:
- Go to AWS Artifact
- Find the AWS FedRAMP Customer Package
- Download the attached CRM document
AWS has also created Customer Compliance Guides (CCG V2) that line up with NIST 800-53 Rev. 5 and nine other compliance frameworks. These extra resources help you better understand control implementation requirements and make your compliance trip smoother.
Assigning responsibility across control families
The CRM splits control responsibilities into three main groups:
- Provider Responsibility – Controls that AWS fully implements
- Customer Responsibility – Controls that customers manage entirely
- Shared Responsibility – Controls that need both parties to implement
The FedRAMP CIS/CRM workbook in Appendix J of the System Security Plan identifies these responsibilities. The matrix shows which party handles specific requirements for each control family. This mapping follows the shared security model. AWS takes care of infrastructure-level controls while customers look after application and data-level security.
Some control families need more customer input than others. Access management (AC), identification and authentication (IA), and audit capabilities (AU) need substantial customer setup even with AWS foundation services. Take access control (AC-2) as an example. AWS might handle accounts for underlying OS and hypervisor parts, but customers must manage application user accounts.
Avoiding control gaps with CRM mapping
Security vulnerabilities often happen because of misunderstood responsibilities or incomplete documentation. Here’s how to prevent them:
- Document inheritance relationships clearly – List exactly which AWS FedRAMP service provides each inherited control
- Address all control elements – Make sure you implement every aspect of each control’s requirements
- Verify documentation alignment – Check your System Security Plan (SSP) against the CRM to maintain consistency
The CRM works like a “Rosetta Stone” that turns legal and technical boundaries into NIST 800-53 compliance terms. Without a solid grasp of this document, implementing controls becomes guesswork. This leads to risky situations where both parties think the other handles specific requirements.
FedRAMP uses a shared security responsibility model. Cloud service providers and customers both play key roles in protecting federal information. The AWS FedRAMP Customer Responsibility Matrix helps organizations outline these boundaries clearly. This leads to better resource allocation and compliant environments with minimal control gaps.
Optimizing Control Inheritance with AWS GovCloud
Image Source: stackArmor
AWS GovCloud pioneers federal cloud adoption. This platform helps agencies meet strict compliance standards while gaining cloud advantages. Strategic inheritance planning with this platform reduces authorization efforts.
Is AWS GovCloud FedRAMP certified?
AWS GovCloud (US) has managed to keep its FedRAMP certification since 2013. The U.S. Department of Health and Human Services granted the original Agency Authority to Operate (ATO). AWS GovCloud received a Joint Authorization Board Provisional Authority-to-Operate (JAB P-ATO) for high impact level. This certification includes over 400 security controls. Federal agencies can now process sensitive workloads such as patient records, financial data, and law enforcement information.
AWS GovCloud (US) operates as an isolated region, unlike standard AWS regions. This specialized environment handles sensitive data and regulated workloads. It meets the FedRAMP High baseline and supports workloads up to Department of Defense Security Requirements Guide Impact Level 5.
Inheritance levels in IaaS vs PaaS vs SaaS
Service models show substantial differences in control inheritance:
- Infrastructure as a Service (IaaS) – Offers about 20% inheritance. IaaS customers using AWS EC2 must manage operating systems, patching, middleware, runtime environments, and applications.
- Platform as a Service (PaaS) – Provides 60%+ inheritance. PaaS handles operating system and runtime environment management to reduce security control burden.
- Software as a Service (SaaS) – Delivers peak inheritance levels when built on FedRAMP-authorized infrastructure.
Each component (IaaS, PaaS, SaaS) needs authorization through inheritance model or traditional authorization. A service doesn’t become FedRAMP compliant just by running on FedRAMP-authorized infrastructure.
Choosing the right AWS FedRAMP services for maximum inheritance
AWS offers many FedRAMP-authorized services. The AWS GovCloud FedRAMP P-ATO boundary with high baseline security categorization includes numerous services. Organizations using AWS GovCloud inherit over 46 FedRAMP-required security controls. This speeds up their compliance process.
AWS Services in Scope by Compliance Program documentation helps verify service authorization status. Services with a “✓” under the FedRAMP tab meet either moderate baseline requirements (AWS East/West) or high baseline requirements (AWS GovCloud).
AWS Artifact gives customers access to Customer Compliance Guides. These guides map to NIST 800-53 Rev. 5 controls and simplify inheritance planning for specific services.
Reducing Authorization Time and Cost with Inheritance
Federal officials estimate that FedRAMP saves between 30-40% of costs associated with cloud assessment, authorization, and continuous monitoring activities. These savings highlight how inheritance transforms the economics of compliance.
Impact of inheritance on ATO timelines
SaaS providers can speed up their authorization process substantially by leveraging inheritance. Those who use established FedRAMP boundaries have cut months off their certification timeline. The full authorization process usually takes 12-18 months, but proper inheritance planning can speed things up substantially.
You should know that inheritance won’t eliminate all the work. Many vendors claim 80% reductions, but the actual direct control responsibility drops by about 30-40% when building on pre-authorized platforms. The reduction still leads to noticeable schedule improvements.
Cost savings from shared assessments
Homeland Security’s former CIO found that the FedRAMP process helps agencies save 90% of the effort needed to assess cloud providers. Assessment reciprocity drives this efficiency – once a provider proves compliance, other agencies can accept that documentation without extra validation.
Providers who use inheritance can cut both audit costs and engineering overhead by up to 40%. Federal agencies looking at multiple cloud services can minimize duplicate work while keeping security standards high through this shared assessment model.
Avoiding rework through early inheritance planning
Smart inheritance planning should happen before working with assessors or agencies. Here are the proven practices:
- Define authorization boundaries that match AWS service boundaries
- List inherited controls clearly in your System Security Plan
- Direct engineering resources toward system-specific controls instead of rebuilding inheritable components
Early planning creates lasting benefits throughout the authorization process. Providers can enable multiple agencies to use their approval with minimal extra assessment once authorized at a specific security level.
Want to discover the full potential of inheritance and speed up your AWS FedRAMP compliance process? Book a Readiness Call to find your best inheritance strategy and avoid common mistakes that delay timelines and raise costs.
Common Pitfalls and How to Avoid Inheritance Gaps
AWS FedRAMP inheritance comes with several challenges that can throw compliance efforts off track. Even with AWS’s reliable infrastructure, organizations run into inheritance gaps that take longer and cost more to fix.
The Inheritance Gap in DoD vs FedCiv environments
The Department of Defense and civilian federal agencies work under different inheritance frameworks. DoD contractors need cloud service providers that meet security requirements “equivalent to those established by the Government for the FedRAMP Moderate baseline”. People have debated what makes something “FedRAMP equivalent” for years.
A new DoD memo sets stricter rules. Cloud services must now achieve 100% compliance with the latest security control baseline through FedRAMP-recognized third-party assessments. DoD’s rules are tougher than civilian agencies – they won’t accept Plans of Action and Milestones (POA&Ms) from third-party organizations.
Misaligned impact levels and broken inheritance
A common problem happens when security impact levels don’t match up. Organizations often label their systems at higher levels than their hosting infrastructure supports. This breaks the inheritance chain. Security teams then need extra controls that cancel out many inheritance benefits.
The move to FedRAMP Rev 5 brought revised controls with new parameters and updated requirements. Teams often look at new controls but miss the updated parameters in existing ones. This oversight creates gaps because security teams miss key requirements.
Lack of CRM or poor documentation from providers
Documentation is the life-blood of inheritance. Gaps appear when there’s no detailed Customer Responsibility Matrix or weak supporting documentation.
Organizations using FedRAMP Moderate Equivalent cloud services must give assessors a CRM to help evaluation. They need system security plans, security assessment plans, security assessment reports, and plans of action and milestones.
DoD has tightened its rules. Contractors – not cloud service providers – must now report compromises and make sure providers follow incident response plans. This change shows why clear documentation matters. Organizations need to spell out AWS and customer responsibilities to avoid dangerous inheritance gaps.
Conclusion
This piece shows how AWS FedRAMP inheritance cuts down costs and time needed for authorization. Companies can save 30-40% on compliance work and reduce the usual 12-18 month timeline by several months. The shared responsibility model makes this possible by clearly showing which security controls AWS handles and which ones customers need to implement.
Service models play a key role in planning your inheritance strategy. IaaS gives you about 20% inheritance, while PaaS environments offer more than 60%. This big difference cuts down your security control workload. AWS GovCloud is special because it has JAB P-ATO at the High impact level. This means you get over 46 FedRAMP security controls right away.
The Customer Responsibility Matrix is your best friend in this process. It shows exactly who handles what requirements for all control families. Teams can avoid risky situations where AWS and customers each think the other side is managing a control.
Good planning makes a huge difference. Teams often break inheritance chains because impact levels don’t match up. They then need to add extra controls they didn’t need. Many teams also miss updated control parameters during Rev 5 changes. This creates gaps even with authorized infrastructure.
Companies that want to speed up their compliance should Book a Readiness Call. This helps find the best inheritance strategies for their setup and helps avoid common mistakes.
AWS FedRAMP inheritance works best when teams know both technical limits and what documents they need. Teams that clearly show inheritance connections, cover all control elements, and match their docs with the CRM find the authorization process easier. This approach helps build secure, compliant systems that meet federal rules without doing the same work twice.
Key Takeaways
Strategic AWS FedRAMP inheritance can dramatically reduce compliance costs and timelines while maintaining rigorous security standards for federal agencies and contractors.
• Leverage AWS GovCloud’s JAB P-ATO certification to inherit 46+ FedRAMP security controls automatically, reducing implementation burden by 30-40%
• Use the Customer Responsibility Matrix (CRM) as your roadmap to clearly define which security controls AWS manages versus customer responsibilities
• Align your system’s impact level with AWS infrastructure authorization to avoid breaking inheritance chains and costly compensating controls
• Focus engineering resources on system-specific controls rather than recreating security mechanisms already validated through AWS’s authorization
• Plan inheritance strategy early in the NIST RMF lifecycle to compress 12-18 month authorization timelines and reduce costs up to $3 million
The key to successful AWS FedRAMP inheritance lies in understanding that compliance becomes primarily a documentation exercise for inherited controls, allowing teams to concentrate on what makes their system unique rather than reinventing foundational security capabilities already provided by AWS GovCloud’s certified infrastructure.
FAQs
Q1. What are inherited controls in AWS’s shared responsibility model? Inherited controls are security measures fully managed by AWS that customers automatically benefit from without additional implementation. These typically include physical and environmental protections for AWS infrastructure.
Q2. How does AWS FedRAMP inheritance reduce compliance costs? AWS FedRAMP inheritance can reduce compliance costs by 30-40% through shared assessments and eliminating redundant security control implementations. Organizations can inherit over 46 FedRAMP-required controls when using AWS GovCloud, significantly decreasing their implementation workload.
Q3. What is the Customer Responsibility Matrix (CRM) and why is it important? The Customer Responsibility Matrix is a crucial document that outlines which security controls are managed by AWS versus those that are the customer’s responsibility. It helps prevent misunderstandings and potential security gaps by clearly defining implementation responsibilities for each control.
Q4. How does the level of inheritance differ between IaaS, PaaS, and SaaS models? Infrastructure as a Service (IaaS) typically offers about 20% inheritance, Platform as a Service (PaaS) can provide 60%+ inheritance, and Software as a Service (SaaS) often delivers the highest inheritance levels. The difference stems from how much of the technology stack is managed by the provider versus the customer.
Q5. What are common pitfalls in AWS FedRAMP inheritance? Common pitfalls include misaligned impact levels between systems and hosting infrastructure, overlooking updated control parameters during FedRAMP revisions, and inadequate documentation of inherited controls. These issues can break the inheritance chain and force implementation of unnecessary compensating controls.