Rule: S3 Bucket Cross-Region Replication Enabled
This rule ensures S3 bucket cross-region replication is enabled to enhance data resilience and redundancy.
| Rule | S3 bucket cross-region replication should be enabled |
| Framework | NIST 800-53 Revision 4 |
| Severity | ✔ Critical |
Rule Description: S3 Bucket Cross-Region Replication for NIST 800-53 Revision 4
Rule Summary:
S3 bucket cross-region replication is a feature provided by AWS that allows you to automatically replicate objects from one S3 bucket to another in a different AWS region. This rule ensures that cross-region replication is enabled for S3 buckets in compliance with the NIST 800-53 Revision 4 security standard.
Detailed Description:
Cross-region replication provides a robust and reliable backup solution by automatically replicating objects stored in one S3 bucket to another bucket in a different region. By enabling this feature, organizations can improve the availability and durability of their data, increase resilience against region-wide outages, and meet regulatory compliance requirements such as NIST 800-53 Revision 4.
When cross-region replication is enabled, AWS automatically replicates newly added or updated objects (and their corresponding metadata) from the source bucket to the destination bucket in a different region. This ensures that data is securely stored in multiple regions, mitigating risks associated with data loss or unavailability.
Troubleshooting Steps:
If cross-region replication is not enabled for an S3 bucket, follow these troubleshooting steps:
- 1.
Verify Bucket Permissions: Check if your IAM user or role has sufficient permissions to enable cross-region replication, especially for the source and destination buckets.
- 2.
Check Bucket Locations: Ensure that both the source and destination buckets are located in different AWS regions. Cross-region replication requires objects to be replicated across regions.
- 3.
Review IAM Role Permissions: Make sure the IAM role associated with the S3 bucket has the necessary permissions to replicate objects. The role should have the
ands3:GetObjectVersion
permissions for the source bucket, ands3:GetReplicationConfiguration
permission for the destination bucket.s3:ReplicateObject - 4.
Confirm Object Replication: Verify that the replication configuration is correctly set for both the source and destination buckets. Ensure that replication rules specify the correct destination region, replication time, and other relevant settings.
Code Examples:
To enable cross-region replication for an S3 bucket, use the AWS Command Line Interface (CLI) with the following steps:
- 1.
Install and configure the AWS CLI.
- 2.
Create a JSON-formatted replication configuration file. Replace the placeholders with appropriate values according to your setup.
{ "Role": "arn:aws:iam::123456789012:role/replication-role", "Rules": [ { "ID": "Rule1", "Status": "Enabled", "Prefix": "", "Destination": { "Bucket": "arn:aws:s3:::destination-bucket", "StorageClass": "STANDARD", "ReplicaKmsKeyId": "arn:aws:kms:us-west-2:123456789012:key/abcd1234-5678-90ab-cdef-1234567890ab", "Region": "us-west-2" } } ] }
- 1.Use the following command to enable cross-region replication for the source bucket:
aws s3 put-bucket-replication --bucket source-bucket --replication-configuration file://path/to/replication-configuration.json
Remember to replace
source-bucketRemediation Steps:
To remediate the issue and enable cross-region replication for an S3 bucket, follow these steps:
- 1.
Review the troubleshooting steps mentioned above to ensure proper configuration and permissions.
- 2.
Enable cross-region replication for the S3 bucket using the appropriate method, either through the AWS Management Console or the AWS CLI.
- 3.
Validate the correctness of the replication configuration, ensuring that the source and destination buckets are located in different regions and other settings are properly defined.
- 4.
Test the replication by adding or updating objects in the source bucket and verifying their presence in the destination bucket.
- 5.
Monitor the replication status and perform periodic checks to ensure successful and ongoing replication.
By following these steps, you can enable cross-region replication for an S3 bucket, ensuring compliance with NIST 800-53 Revision 4 security requirements.