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Unencrypted S3 bucket.

Default Severity: high

Explanation

S3 Buckets should be encrypted with customer managed KMS keys and not default AWS managed keys, in order to allow granular control over access to specific buckets.

Possible Impact

The bucket objects could be read if compromised

Suggested Resolution

Configure bucket encryption

Insecure Example

The following example will fail the aws-s3-enable-bucket-encryption check. 

 resource "aws_s3_bucket" "bad_example" {
   bucket = "mybucket"
 }

Secure Example

The following example will pass the aws-s3-enable-bucket-encryption check. 

 resource "aws_s3_bucket" "good_example" {
   bucket = "mybucket"

   server_side_encryption_configuration {
     rule {
       apply_server_side_encryption_by_default {
         kms_master_key_id = "arn"
         sse_algorithm     = "aws:kms"
       }
     }
   }
 }