S3 Public Access Block Account Rule
This rule ensures blocking S3 public access at the account level for security compliance.
| Rule | S3 public access should be blocked at account level |
| Framework | FedRAMP Low Revision 4 |
| Severity | ✔ Medium |
Rule Description
This rule ensures that public access to Amazon S3 buckets is blocked at the account level. It is specifically designed to meet the standards outlined in the FedRAMP (Federal Risk and Authorization Management Program) Low Revision 4 compliance requirements.
By implementing this rule, you can prevent unauthorized access and protect sensitive data stored in S3 buckets hosted within your AWS account.
Troubleshooting Steps
In case you encounter any issues while implementing or enforcing this rule, you can follow these troubleshooting steps:
- 1.
Double-check rule configuration: Ensure that the rule is properly configured to enforce the blocking of public access at the account level. Review the rule settings to validate that it aligns with the FedRAMP Low Revision 4 compliance requirements.
- 2.
Verify IAM permissions: Validate that the IAM (Identity and Access Management) policies associated with your AWS account grant sufficient permissions to enforce this rule. Ensure that necessary permissions are in place for making changes and blocking public access to S3 buckets.
- 3.
Check bucket policies: Review the bucket policies applied to your S3 buckets. Verify that they do not allow public access and are consistent with the account-level blocking requirements. Make any necessary changes to align the policies with the rule.
- 4.
Review bucket ACLs: Ensure that the Access Control Lists (ACLs) for your S3 buckets are properly configured to deny public access. Validate that there are no misconfigured permissions or overly permissive settings in the ACLs.
- 5.
Test access restrictions: Perform thorough testing to verify that public access is indeed blocked at the account level. Attempt to access your S3 buckets publicly and confirm if the designated access restrictions are effective.
Necessary Codes
There are no specific codes provided for this rule. However, you can use the following AWS CLI commands to assist with implementing and enforcing this rule:
- 1.aws s3api put-public-access-block: Use this command to configure the public access block settings for your AWS S3 account.
aws s3api put-public-access-block --account-id YOUR_ACCOUNT_ID --public-access-block-configuration "BlockPublicAcls=true,IgnorePublicAcls=true,BlockPublicPolicy=true,RestrictPublicBuckets=true"
Note: Replace
with your actual AWS account ID.YOUR_ACCOUNT_ID
- 1.aws s3 ls s3://BUCKET_NAME: This command allows you to list the contents of an S3 bucket. Use it to verify if public access is blocked for your S3 buckets.
aws s3 ls s3://BUCKET_NAME
Note: Replace
with the name of your S3 bucket.BUCKET_NAME
Step-by-Step Guide for Remediation
Follow these steps to implement and remediate any issues related to blocking public access at the account level for FedRAMP Low Revision 4 compliance:
- 1.
Access the AWS Management Console and sign in to your AWS account with appropriate credentials.
- 2.
Open the Amazon S3 service by searching for "S3" in the services search bar and selecting it.
- 3.
On the Amazon S3 dashboard, click on your account name in the top-right corner and select "AWS S3 Management Console" from the dropdown menu.
- 4.
In the S3 Management Console, navigate to "Account Settings" by clicking on the Account name in the top-right corner and selecting "Account Settings" from the dropdown menu.
- 5.
Scroll down to the "Block public access (account settings)" section and click on the "Edit" button.
- 6.
Ensure that all checkboxes under "Block public access" are selected. This includes "Block public access to buckets and objects granted through new access control lists (ACLs)", "Block public access to buckets and objects granted through any access control list (ACL)", "Block public access to buckets and objects granted through new public bucket or access point policies", and "Block public and cross-account access to buckets and objects through any public bucket or access point policies".
- 7.
Click on the "Save changes" button to apply the updated account settings.
- 8.
Review the bucket policies and ACLs for your S3 buckets to confirm that they do not allow any public access. Make necessary changes to align them with the account-level blocking requirements.
- 9.
Test the access restrictions by attempting to access your S3 buckets publicly. Use the AWS CLI command
to verify if public access is successfully blocked.aws s3 ls s3://BUCKET_NAME - 10.
Repeat the above steps for all relevant S3 buckets within your AWS account.
By following these steps, you can enforce the blocking of public access at the account level for your S3 buckets, ensuring compliance with the specific FedRAMP Low Revision 4 requirements.