S3 bucket must block public bucket policies
Critical
AWS
General
aws-s3-bucket-bucket-block-public-bucket
Applies to
AWS::S3::Bucket
What CGPulse checks
A resource passes this rule when blockPublicPolicy must equal true. Anything else is reported as a finding with the evaluated property value attached as evidence.
How to fix it
Enable Block Public Policy to reject any bucket policy granting public access. In AWS Console: S3 > Bucket > Permissions > Block public access > enable Block public bucket policies. See: https://docs.aws.amazon.com/AmazonS3/latest/userguide/access-control-block-public-access.html
Terraform
resource "aws_s3_bucket_public_access_block" "{name}" {
bucket = aws_s3_bucket.{name}.id
block_public_policy = true
}
Compliance frameworks
Is your environment compliant with this rule?
CGPulse checks it — and 621 others — against your Azure and AWS accounts with read-only access.
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