Resource with over permissive S3 GetObject permissions (via IAM Group inline)

Security & Compliance
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An AWS resource associated with an IAM group inline policy with S3:GetObject action to a destination S3 bucket is typically an S3 object or a collection of S3 objects stored within the bucket. The IAM group inline policy is a set of permissions that defines the level of access granted to the group members for the specified S3 bucket. The S3:GetObject action allows the IAM group members to retrieve (or download) the specified S3 object(s) from the bucket. The destination S3 bucket is the target location where the S3 objects reside and where the IAM group members have been granted access to retrieve the objects. This configuration provides the IAM group members with the necessary permissions to access the S3 objects in the destination bucket, while also ensuring that access is restricted to only authorized users.


If you have identified an IAM Group inline policy with over-permissive S3 GetObject permissions, you should take the following remediation steps:

  1. Review and assess the potential impact: Before making any changes, you should review and assess the potential impact of changing the permissions. Determine if any applications or services depend on the current permissions and whether any data will be affected by the change.
  2. Restrict the permissions: Update the IAM Group inline policy to restrict access to the resource. Specifically, remove the "s3:GetObject" permission from the policy for the identified S3 bucket, and grant access only to the required users, roles, or applications.
  3. Test the updated policy: Once you have updated the policy, test the new policy to verify that it restricts access to the S3 bucket as intended. Ensure that the required users, roles, or applications can still access the data they need while other users are denied access.
  4. Monitor for unauthorized access: Monitor the S3 access logs for any unauthorized access attempts or unusual activity. This will help you to identify any further security issues and to take appropriate action.
  5. Educate users: Educate users about the importance of maintaining appropriate access controls and the potential risks of over-permissive access policies. Encourage users to report any suspected security incidents promptly.
  6. Periodically review access permissions: Regularly review the access permissions for S3 resources to ensure that they remain appropriate and up-to-date. This will help to prevent future over-permissive access policies and potential security risks.
  7. Consider using S3 bucket policies: As an additional security measure, you may also want to consider using S3 bucket policies to further restrict access to the S3 bucket. Bucket policies allow you to set more fine-grained permissions at the bucket level, and can help to prevent over-permissive access policies from being created in the future.
Enforced Resources
Note: Remediation steps provided by Lightlytics are meant to be suggestions and guidelines only. It is crucial to thoroughly verify and test any remediation steps before applying them to production environments. Each organization's infrastructure and security needs may differ, and blindly applying suggested remediation steps without proper testing could potentially cause unforeseen issues or vulnerabilities. Therefore, it is strongly recommended that you validate and customize any remediation steps to meet your organization's specific requirements and ensure that they align with your security policies and best practices.