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Cis AWS Compute 11.1

DevOps & Security
cis-aws-compute-11.1

Cis AWS Compute 11.1 is an Agent Skill for devops & security published in the CyberStrikeus/CyberStrike repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Ensure customer-managed keys are used to encrypt AWS Fargate ephemeral storage data for Amazon ECS

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Inspect the Agent Skill at https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Cloud_Providers/AWS/CIS_AWS_Compute_Services_Benchmark_v1.1.0/cis-aws-compute-11.1/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/cis-aws-compute-11-1, but wait for my approval before writing files or running scripts.

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11.1 Ensure customer-managed keys are used to encrypt AWS Fargate ephemeral storage data for Amazon ECS (Automated)

Description

Use customer-managed AWS KMS keys to encrypt AWS Fargate ephemeral storage data for on Amazon ECS, ensuring that sensitive data remains protected during task execution.

Rationale

Customer-managed KMS keys offer enhanced control over encryption, including key rotation, access policies, and audit trails.

Impact

There are costs and configuration overhead associated with setting up and managing customer-managed keys.

Audit Procedure

Using AWS Console

  1. Login to the ECS console using https://console.aws.amazon.com/ecs/.
  2. In the left panel, click Clusters.
  3. Click the name of a cluster.
  4. Ensure that Fargate ephemeral storage is not set to -.
  5. Repeat steps 1-4 for each ECS cluster.

Using AWS CLI

Run the following command to list clusters:

aws ecs list-clusters

Run the following command to view the Fargate ephemeral storage KMS key ID configured for a cluster:

aws ecs describe-clusters --clusters <cluster-arn> --include CONFIGURATIONS --query 'clusters[*].configuration.managedStorageConfiguration.fargateEphemeralStorageKmsKeyId'

Ensure the command returns a customer-managed KMS key ARN. Repeat for each cluster.

Expected Result

Each ECS cluster returns a valid customer-managed KMS key ARN for the Fargate ephemeral storage configuration, rather than - or empty.

Remediation

Using AWS Console

  1. Login to the ECS console using https://console.aws.amazon.com/ecs/.
  2. In the left panel, click Clusters.
  3. Click the name of a cluster.
  4. Click Update cluster.
  5. Expand the Encryption section.
  6. Under Fargate ephemeral storage, select a customer-managed KMS key. Note: Ensure the KMS key has appropriate Fargate service permissions.
  7. Click Update.
  8. Repeat steps 1-7 for each ECS cluster requiring remediation.

Using AWS CLI

N/A - Remediation is console-based for this control.

Default Value

AWS Fargate ephemeral storage data is encrypted by default.

References

  1. https://docs.aws.amazon.com/AmazonECS/latest/developerguide/fargate-storage-encryption.html
  2. https://docs.aws.amazon.com/AmazonECS/latest/developerguide/fargate-create-storage-key.html
  3. https://awscli.amazonaws.com/v2/documentation/api/2.0.33/reference/ecs/list-clusters.html
  4. https://awscli.amazonaws.com/v2/documentation/api/2.0.33/reference/ecs/describe-clusters.html

CIS Controls

Controls VersionControlIG 1IG 2IG 3
v83.11 Encrypt Sensitive Data at RestXX
v714.8 Encrypt Sensitive Information at RestX

Profile

Level 2 | Automated