S3 bucket without versioning

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Metadata

Id: cloudformation-aws-s3-bucket-without-versioning

Provider: AWS

Platform: CloudFormation

Severity: Medium

Category: Backup

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Description

S3 buckets should have object versioning enabled to protect data from accidental or malicious deletion. Versioning also preserves prior object states for recovery and auditing.

In CloudFormation, AWS::S3::Bucket resources must include Properties.VersioningConfiguration.Status set to Enabled. Resources that omit VersioningConfiguration, or have VersioningConfiguration.Status set to Suspended, will be flagged.

Secure configuration example:

MyBucket:
  Type: AWS::S3::Bucket
  Properties:
    BucketName: my-bucket
    VersioningConfiguration:
      Status: Enabled

Compliant Code Examples

Resources:
  RecordServiceS3Bucket:
    Type: 'AWS::S3::Bucket'
    DeletionPolicy: Retain
    Properties:
      ReplicationConfiguration:
        Role:
          'Fn::GetAtt':
            - WorkItemBucketBackupRole
            - Arn
        Rules:
          - Destination:
              Bucket:
                'Fn::Join':
                  - ''
                  - - 'arn:aws:s3:::'
                    - 'Fn::Join':
                        - '-'
                        - - Ref: 'AWS::Region'
                          - Ref: 'AWS::StackName'
                          - replicationbucket
              StorageClass: STANDARD
            Id: Backup
            Prefix: ''
            Status: Enabled
      VersioningConfiguration:
        Status: Enabled

Non-Compliant Code Examples

Resources:
  RecordServiceS3Bucket:
    Type: 'AWS::S3::Bucket'
    DeletionPolicy: Retain
    Properties:
      ReplicationConfiguration:
        Role:
          'Fn::GetAtt':
            - WorkItemBucketBackupRole
            - Arn
        Rules:
          - Destination:
              Bucket:
                'Fn::Join':
                  - ''
                  - - 'arn:aws:s3:::'
                    - 'Fn::Join':
                        - '-'
                        - - Ref: 'AWS::Region'
                          - Ref: 'AWS::StackName'
                          - replicationbucket
              StorageClass: STANDARD
            Id: Backup
            Prefix: ''
            Status: Enabled

Resources:
  RecordServiceS3Bucket2:
    Type: 'AWS::S3::Bucket'
    DeletionPolicy: Retain
    Properties:
      ReplicationConfiguration:
        Role:
          'Fn::GetAtt':
            - WorkItemBucketBackupRole
            - Arn
        Rules:
          - Destination:
              Bucket:
                'Fn::Join':
                  - ''
                  - - 'arn:aws:s3:::'
                    - 'Fn::Join':
                        - '-'
                        - - Ref: 'AWS::Region'
                          - Ref: 'AWS::StackName'
                          - replicationbucket
              StorageClass: STANDARD
            Id: Backup
            Prefix: ''
            Status: Enabled
      VersioningConfiguration:
        Status: Suspended