AWS AmazonDynamoDBReadOnlyAccess Managed Policy is an AWS managed policy that grants read-only access to Amazon DynamoDB resources. It supports inspection and reporting without allowing changes, but it can still expose application data and table structure. Assign it only where read access is required and monitor for unexpected data enumeration.
What the policy actually does
AmazonDynamoDBReadOnlyAccess is a managed AWS policy that permits inspection of DynamoDB resources without write privileges. It is useful for reporting, troubleshooting, and inventory work, but it still exposes table names, schema patterns, and the data returned by read operations.
Because it is read-only rather than no-access, the practical question is not whether it can change data, but whether the principal assigned to it should be able to see the information stored in DynamoDB at all. That makes scope discipline the main control concern.
Where read-only access becomes sensitive
DynamoDB read access can still reveal business-sensitive records, identifiers, and application structure. Even when a policy blocks mutation, broad read access can support recon, data harvesting, and dependency mapping across environments.
That is why least privilege matters here: read-only should be granted to the narrowest workload, role, or operator that genuinely needs it, and only for the tables or accounts that are in scope. For broader AWS policy design and evaluation logic, see AWS IAM Policies and Roles Guide.
How to think about exposure and monitoring
Organizations should treat this policy as an information exposure control, not just an access convenience. If a role with this policy is compromised, the attacker may not be able to alter records, but it can still enumerate data, learn table relationships, and use that visibility to plan follow-on abuse.
Monitoring should therefore focus on unexpected read patterns, unusual query volume, broad scans, and principals that begin accessing tables outside their normal job function. For cloud credential abuse scenarios that start with excessive or exposed access, see 230M AWS environment compromise.
Practical use in AWS environments
This policy is appropriate when a principal needs visibility but not modification, such as reporting jobs, audit workflows, or support functions that inspect table state. It is not a substitute for a tightly designed application role, because application read paths often need table-by-table scoping rather than broad read access across an account.
When you are reviewing whether a principal should use managed read access, also check whether the underlying workload is actually a workload identity rather than a human operator. In many AWS designs, the safer pattern is to grant the workload exactly the access it needs and avoid long-lived broad permissions. The broader pattern is covered in Cloud Workload Identity Guide.
Risk and Threat Considerations
Read-only access reduces mutation risk, but it does not eliminate confidentiality or recon risk. If the policy is attached too widely, an attacker or insider can still enumerate records, map data relationships, and harvest sensitive application information without ever writing to the table.
Failure mechanism: Overbroad assignment, role compromise, or unintended reuse of a read-only principal turns inspection access into a data-exposure path, especially when the policy is attached to automation or support roles that can reach many tables.
Impact: Exposed table contents can enable fraud preparation, account targeting, operational intelligence gathering, and lateral planning, even though the policy itself does not permit writes.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, CIS Controls v8 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AC-3 — Access Enforcement | Read-only policy scope depends on enforcing who can access DynamoDB data. |
| AU-6 — Audit Record Review, Analysis, and Reporting | Unexpected enumeration and abnormal read patterns require review and analysis. | |
| IA-5 — Authenticator Management | Policy abuse often follows compromise of the credentials that can use it. | |
| Recommendation — Limit DynamoDB read permissions to the specific roles and tables that need inspection. Review DynamoDB access logs for unusual scans, query bursts, and off-pattern reads. Rotate and manage the credentials or tokens behind any principal that used the policy abnormally. | ||
| CIS Controls v8 | CIS-6 — Access Control Management | Managed read access is an access governance problem, not just a permissions detail. |
| Recommendation — Remove unnecessary DynamoDB read access and keep role grants narrowly scoped. | ||
| NIST CSF 2.0 | PR.AA-05 — Identity Access Management | The policy is an identity-and-access decision about who may read protected data. |
| Recommendation — Assign DynamoDB read access only to identities with a defined business need. | ||
Practitioner Guidance
Why practitioners should care: Treat this policy as a scoped visibility grant, not a harmless default. The main judgement is whether the principal truly needs to see DynamoDB data, because read access can be enough to create a material exposure if the table contains sensitive or production information.
What to watch for: Review who inherits the policy, whether it is attached to shared roles, and whether read activity matches the role’s job function. Unexpected scans, broad table access, or reuse across environments are the signals that the policy is too permissive for its purpose.