Ensure a Log Metric Filter and Alarm Exist for S3 Bucket Policy Changes Rule
This rule ensures the presence of a log metric filter and alarm for monitoring S3 bucket policy changes.
| Rule | Ensure a log metric filter and alarm exist for S3 bucket policy changes |
| Framework | NIST Cybersecurity Framework (CSF) v1.1 |
| Severity | ✔ Low |
Rule Description:
This rule ensures that a log metric filter and alarm are implemented for any changes made to the S3 bucket policy in compliance with the NIST Cybersecurity Framework (CSF) v1. By monitoring and setting up appropriate alerts, this helps organizations detect potentially unauthorized modifications to their S3 bucket policies, mitigating the risk of unauthorized access or data breaches.
Troubleshooting Steps:
- 1.Verify that the S3 bucket policy change log metric filter and alarm do not already exist.
- 2.Check if the appropriate permissions are assigned to create log metric filters and alarms for the target S3 bucket policy.
- 3.Ensure that the NIST Cybersecurity Framework (CSF) v1 is being followed, and the requirement for monitoring S3 bucket policy changes is specified.
Necessary Codes:
No specific codes are provided for this rule, as it is primarily focused on the configuration and monitoring aspects of the S3 bucket policy changes. However, if you are using infrastructure-as-code frameworks such as AWS CloudFormation or Terraform, you can refer to their respective documentation for creating log metric filters and alarms.
Remediation Steps:
Follow these steps to implement the necessary log metric filter and alarm for S3 bucket policy changes:
- 1.
Open the AWS Management Console and navigate to the CloudWatch service.
- 2.
Select the appropriate region where the target S3 bucket is located.
- 3.
In the left navigation pane, click on "Logs" and choose the log group associated with the S3 bucket.
- 4.
Click on "Create Metric Filter" and provide the following information:
- Filter pattern: [Enter the filter pattern that captures the S3 bucket policy changes]
- Log format: [Select the appropriate log format, e.g., S3 Access Logs]
- Metric details: [Specify the metric namespace, name, and value that should be used for the filter]
- Assign appropriate permissions if prompted.
- 5.
Once the metric filter is created, navigate to the CloudWatch service dashboard and select "Alarms" from the left navigation pane.
- 6.
Click on "Create Alarm" and configure the alarm based on your requirements:
- Specify the metric filter you created in the previous step.
- Set the threshold, duration, and any additional conditions that trigger the alarm.
- Configure the actions to be taken when the alarm state is triggered (e.g., sending notifications via SNS).
- Assign appropriate permissions if prompted.
- 7.
Review your configuration, and click on "Create Alarm" to finalize the process.
Conclusion:
By following these steps, you will enable the monitoring of S3 bucket policy changes in compliance with the NIST Cybersecurity Framework (CSF) v1. This will help ensure the security and integrity of your S3 bucket policies by promptly detecting and responding to any unauthorized modifications.