turbot/aws_compliance
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Control: 2 S3 buckets should prohibit public read access

Description

This control checks whether your S3 buckets allow public read access by evaluating the Block Public Access settings, the bucket policy, and the bucket access control list (ACL).

Unless you explicitly require everyone on the internet to be able to write to your S3 bucket, you should ensure that your S3 bucket is not publicly writable.

It does not check for read access to the bucket by internal principals, such as IAM roles. You should ensure that access to the bucket is restricted to authorized principals only.

Remediation

  1. Open the Amazon S3 console.
  2. Choose the name of the bucket identified in the finding.
  3. Choose Permissions and then choose Public access settings.
  4. Choose Edit, select all four options, and then choose Save.
  5. If prompted, enter confirm and then choose Confirm.

Usage

Run the control in your terminal:

powerpipe control run aws_compliance.control.foundational_security_s3_2

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run aws_compliance.control.foundational_security_s3_2 --share

SQL

This control uses a named query:

s3_bucket_restrict_public_read_access

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