Ensure S3 buckets are encrypted with KMS by default

Error: S3 buckets are not encrypted with KMS

Bridgecrew Policy ID: BC_AWS_GENERAL_56
Checkov Check ID: CKV_AWS_145
Severity: LOW

S3 buckets are not encrypted with KMS

Description

Encrypting your data and resources with KMS helps protect your data from unauthorized access or tampering. By encrypting your data, you can ensure that only authorized users can access and decrypt the data, and that the data is protected while in storage or in transit. Such action can help protect against external threats such as hackers or malware, as well as internal threats such as accidental or unauthorized access.

Fix - Buildtime

Terraform

  • Resource: aws_s3_bucket
  • Argument: pply_server_side_encryption_by_default.kms_master_key_id
resource "aws_s3_bucket" "mybucket" {
  ...
  server_side_encryption_configuration {
    rule {
      apply_server_side_encryption_by_default {
        kms_master_key_id = aws_kms_key.mykey.arn
 +      sse_algorithm     = "aws:kms"
      }
    }
  }
}