Ensure S3 Bucket BlockPublicPolicy is set to True

Error: S3 bucket BlockPublicPolicy is not set to True

Policy ID: BC_AWS_S3_20
Checkov Check ID: CKV_AWS_54
Severity: MEDIUM

S3 bucket BlockPublicPolicy is not set to True

Description

Amazon S3 Block Public Access policy works at the account level and on individual buckets, including those created in the future. It provides the ability to block existing public access, whether specified by an ACL or a policy, and ensures public access is not granted to newly created items.

If an AWS account is used to host a data lake or another business application, blocking public access will serve as an account-level guard against accidental public exposure.

Fix - Buildtime

Terraform
Resource: aws_s3_bucket_public_access_block
Argument: block_public_policy

resource "aws_s3_bucket_public_access_block" "artifacts" {
  count  = var.bucketname == "" ? 1 : 0
  bucket = aws_s3_bucket.artifacts[0].id
  
  block_public_acls   = true
+ block_public_policy = true
  restrict_public_buckets = true
  ignore_public_acls=true
}

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