cis-aws-foundations-6-1-1

name	cis-aws-foundations-6.1.1
description	Ensure EBS volume encryption is enabled in all regions
category	cis-networking
version	7.0.0
author	cyberstrike-official
tags	["cis","aws","networking","ec2","ebs","encryption"]
cis_id	6.1.1
cis_benchmark	CIS AWS Foundations Benchmark v7.0.0
tech_stack	["aws"]
cwe_ids	[]
chains_with	["cis-aws-foundations-6.1.2"]
prerequisites	[]
severity_boost	{}

Ensure EBS volume encryption is enabled in all regions

Description

Elastic Compute Cloud (EC2) supports encryption at rest when using the Elastic Block Store (EBS) service. While disabled by default, forcing encryption at EBS volume creation is supported.

Rationale

Encrypting data at rest reduces the likelihood of unintentional exposure and can nullify the impact of disclosure if the encryption remains unbroken.

Impact

Losing access to or removing the KMS key used by the EBS volumes will result in the inability to access the volumes.

Audit Procedure

Using AWS Console

1. Login to the AWS Management Console and open the Amazon EC2 console using https://console.aws.amazon.com/ec2/.
2. Under Account attributes, click Data Protection and Security.
3. Under EBS encryption, verify that Always encrypt new EBS volumes displays Enabled.
4. Repeat for each region in use.

Note: EBS volume encryption is configured per region.

Using AWS CLI

1. Run the following command:

aws --region <region> ec2 get-ebs-encryption-by-default

2. Verify that "EbsEncryptionByDefault": true is displayed.
3. Repeat for each region in use.

Expected Result

"EbsEncryptionByDefault": true should be displayed for every region in use.

Remediation

Using AWS Console

1. Login to the AWS Management Console and open the Amazon EC2 console using https://console.aws.amazon.com/ec2/.
2. Under Account attributes, click Data protection and security.
3. Under EBS encryption, Click Manage.
4. Check the Enable box to default encryption.
5. Click Update EBS encryption.
6. Repeat for each region in which EBS volume encryption is not enabled by default.

Using AWS CLI

1. Run the following command:

aws --region <region> ec2 enable-ebs-encryption-by-default

2. Verify that is displayed.