terraform.aws.security.aws-cloudwatch-log-group-unencrypted.aws-cloudwatch-log-group-unencrypted

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By default, AWS CloudWatch Log Group is encrypted using AWS-managed keys. However, for added security, it's recommended to configure your own AWS KMS encryption key to protect your log group in CloudWatch. You can either create a new aws_kms_key resource or use the ARN of an existing key in your AWS account to do so.

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Defintion

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rules:
  - id: aws-cloudwatch-log-group-unencrypted
    patterns:
      - pattern: |
          resource "aws_cloudwatch_log_group" $ANYTHING {
            ...
          }
      - pattern-not-inside: |
          resource "aws_cloudwatch_log_group" $ANYTHING {
            ...
            kms_key_id = ...
            ...
          }
    message: By default, AWS CloudWatch Log Group is encrypted using AWS-managed
      keys. However, for added security, it's recommended to configure your own
      AWS KMS encryption key to protect your log group in CloudWatch. You can
      either create a new aws_kms_key resource or use the ARN of an existing key
      in your AWS account to do so.
    languages:
      - hcl
    severity: WARNING
    metadata:
      owasp:
        - A02:2021 - Cryptographic Failures
      cwe:
        - "CWE-732: Incorrect Permission Assignment for Critical Resource"
      technology:
        - aws
        - terraform
      category: security
      references:
        - https://cwe.mitre.org/data/definitions/732.html
      cwe2021-top25: true
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authorization

Examples

aws-cloudwatch-log-group-unencrypted.tf

resource "aws_cloudwatch_log_group" "pass" {
  retention_in_days = 1
  kms_key_id        = "someKey"
}
# ruleid: aws-cloudwatch-log-group-unencrypted
resource "aws_cloudwatch_log_group" "fail" {
  retention_in_days = 1
}