Encrypt

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Event Information

• The Encrypt event in AWS for KMS refers to the process of encrypting data using the AWS Key Management Service (KMS).
• When this event occurs, it means that a specific data object or resource has been encrypted using a KMS key.
• This event is important for security and compliance purposes, as it ensures that sensitive data is protected and can only be accessed by authorized users with the necessary encryption keys.

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Examples

• Encrypting data using AWS Key Management Service (KMS) can impact security if the encryption keys are not properly managed and protected. This can lead to unauthorized access to sensitive data.
• If the encryption keys used for KMS are weak or easily guessable, it can compromise the security of the encrypted data.
• If the encryption keys are not rotated regularly, it increases the risk of unauthorized access to the encrypted data over time.

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Remediation

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Using Console

1. Identify the affected AWS KMS key:
   • Log in to the AWS Management Console.
   • Go to the AWS Key Management Service (KMS) console.
   • Navigate to the “Customer managed keys” section.
   • Look for the key mentioned in the previous response.
2. Update key policy to restrict access:
   • Select the key from the list.
   • Click on the “Key policy” tab.
   • Review the existing key policy and identify the necessary changes based on the examples provided.
   • Click on the “Edit” button to modify the key policy.
   • Make the required changes to restrict access to the key.
   • Ensure that only authorized IAM users or roles have the necessary permissions.
   • Save the updated key policy.
3. Monitor and review key usage:
   • Enable AWS CloudTrail to capture API calls related to the KMS key.
   • Set up CloudWatch alarms to notify you of any suspicious or unauthorized key usage.
   • Regularly review the CloudTrail logs and CloudWatch alarms to detect any potential security issues.
   • Take appropriate actions if any unauthorized access or suspicious activity is identified, such as rotating the key or revoking access.

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Using CLI

1. Enable AWS KMS key rotation:
   • Use the enable-key-rotation command to enable key rotation for a specific AWS KMS key.
   • Example: aws kms enable-key-rotation --key-id <key-id>
2. Enable AWS KMS key deletion protection:
   • Use the enable-key-deletion command to enable deletion protection for a specific AWS KMS key.
   • Example: aws kms enable-key-deletion --key-id <key-id>
3. Enable AWS KMS key usage audit logging:
   • Use the enable-key-usage-logging command to enable key usage audit logging for a specific AWS KMS key.
   • Example: aws kms enable-key-usage-logging --key-id <key-id>

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Using Python

1. Enable AWS CloudTrail for KMS:
   • Use the boto3 library to create a new CloudTrail trail for KMS.
   • Set the appropriate parameters such as the S3 bucket to store the logs and the KMS key to encrypt the logs.
   • Enable logging for KMS API events by specifying the appropriate event selectors.

import boto3

def enable_cloudtrail_kms():
    client = boto3.client('cloudtrail')
    
    response = client.create_trail(
        Name='kms-trail',
        S3BucketName='your-s3-bucket',
        KmsKeyId='your-kms-key-id',
        IsMultiRegionTrail=True
    )
    
    response = client.update_trail(
        Name='kms-trail',
        EventSelectors=[
            {
                'ReadWriteType': 'All',
                'IncludeManagementEvents': True,
                'DataResources': [
                    {
                        'Type': 'AWS::KMS::Key',
                        'Values': ['*']
                    }
                ]
            }
        ]
    )

2. Enable AWS Config for KMS:
   • Use the boto3 library to create a new AWS Config rule for KMS.
   • Specify the rule parameters such as the required KMS key tags and the desired compliance level.

import boto3

def enable_aws_config_kms():
    client = boto3.client('config')
    
    response = client.put_config_rule(
        ConfigRule={
            'ConfigRuleName': 'kms-key-tags',
            'Description': 'Enforce required tags on KMS keys',
            'Scope': {
                'ComplianceResourceTypes': [
                    'AWS::KMS::Key'
                ]
            },
            'Source': {
                'Owner': 'AWS',
                'SourceIdentifier': 'KMS_KEY_TAGS'
            },
            'InputParameters': '{"requiredTags": ["tag1", "tag2"]}',
            'MaximumExecutionFrequency': 'TwentyFour_Hours'
        }
    )

3. Enable AWS Security Hub for KMS:
   • Use the boto3 library to enable AWS Security Hub for KMS.
   • Specify the appropriate product ARN for KMS.

import boto3

def enable_security_hub_kms():
    client = boto3.client('securityhub')
    
    response = client.batch_enable_standards(
        StandardsSubscriptionRequests=[
            {
                'StandardsArn': 'arn:aws:securityhub:::ruleset/cis-aws-foundations-benchmark/v/1.2.0',
                'ProductArn': 'arn:aws:securityhub:us-west-2:123456789012:product/aws/securityhub'
            }
        ]
    )