Ensure there is one Amazon KMS Customer Master Key (CMK) created in your AWS account for the app tier in order to protect data that transits your AWS application stack, have full control over encryption process, and meet security and compliance requirements. The AWS resources within your app tier should have a tag set such as <app_tier_tag>:<app_tier_tag_value>, where <app_tier_tag> is the tag name and <app_tier_tag_value> is the tag value. Prior to running this rule by the Cloud Conformity engine, the app-tier tags must be configured within the rule settings, on your Cloud Conformity account dashboard.
This rule can help you with the following compliance standards:
- APRA
- MAS
For further details on compliance standards supported by Conformity, see here.
This rule resolution is part of the Conformity Security & Compliance tool for AWS.
When you use your own AWS KMS Customer Master Key (CMK) to protect your app stack data, you gain full control over who can use this key to access the data, implementing the principle of least privilege on encryption key ownership and usage. The KMS service allows you to easily rotate, audit and disable the encryption key created for your app tier.
Note: Make sure that you replace all <app_tier_tag>: <app_tier_tag_value> tag placeholders found in the conformity rule content with your own tag name and value created for the app tier.
Audit
To determine if an app-tier KMS Customer Master Key is currently available in your AWS account, perform the following actions:
Remediation / Resolution
To create a dedicated AWS KMS Customer Master Key (CMK) to be used by AWS resources and services within your app stack, perform the following:
References
- AWS Documentation
- What is AWS Key Management Service?
- AWS Key Management Service Concepts
- Viewing Keys
- Creating Keys
- Tagging Keys
- CIS Amazon Web Services Foundations
- AWS Command Line Interface (CLI) Documentation
- kms
- list-keys
- list-resource-tags
- create-key
- create-alias
- tag-resource
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You are auditing:
App-Tier KMS Customer Master Key (CMK) In Use
Risk Level: Medium