S3 is used in several accounts.
Prevent an individual bucket misconfiguration from exposing data publicly.
Which control is most appropriate?
Apply S3 Block Public Access as an account or organizational guardrail to block public access paths.
Detailed explanation
The higher-level settings block public access paths and reduce bucket-level configuration risk.
The higher-level settings block public access paths and reduce bucket-level configuration risk.
DNS does not disable a public S3 bucket policy.
DNS does not disable a public S3 bucket policy.
Unrestricted changes weaken governance and do not prevent accidental exposure.
Unrestricted changes weaken governance and do not prevent accidental exposure.
A name does not control authorization or public access.
A name does not control authorization or public access.
Check official documentation
Compare the following points with the official documentation.
Amazon S3 Block Public Accessの公式説明を確認する。
What to confirm
バケット単位の設定とアカウント全体の公開ブロックを区別できる。
Key points
- S3 Block Public Access
- Public access
- Account guardrail
Notes
- Environment: AWS公式S3ドキュメントの確認
- Confirm current AWS service behavior in the official documentation.
Foundation review
Preventive control
A guardrail reduces accidental exposure even when a bucket setting is changed.
Name versus authorization
A hard-to-guess name does not replace an authorization boundary.