It seems like every week there is a new data breach caused by poorly secured cloud storage. We are auditing our environments but want a proactive approach. What automated guardrails or policies should we deploy to enforce flawless and stop developers from accidentally exposing sensitive object storage to the public internet?
3 answers
Proactive enforcement requires a combination of organization-level policies and continuous automated remediation. First, enable the "Block Public Access" setting at the root AWS Organization or Azure Management Group level to completely override any individual bucket settings. Second, integrate static application security testing into your CI/CD pipelines to scan Terraform or CloudFormation templates for misconfigurations before deployment. Finally, use cloud native tools like AWS Config or Azure Policy to automatically trigger an automated Lambda function or runbook to remediate and close any storage bucket that deviates from compliant configurations.
Automated remediation is powerful, but doesn't instantly shutting down public access risk breaking legitimate public assets, like public-facing web images or assets hosted by marketing teams?
Always enforce default server-side encryption and use object versioning so that even if data is altered or accessed, you can recover it instantly.
Encryption coupled with strict KMS key policies adds an extra layer of defense, ensuring that even if a bucket is exposed, the underlying data remains unreadable to unauthorized users.
To avoid breaking things, you should isolate public assets into a completely separate, dedicated cloud account. Your automated remediation policies should heavily restrict your core data accounts while allowing specific exceptions only within the designated public asset zone, which keeps your critical infrastructure safe.