All checks
Critical S3 · account

S3 general purpose buckets should block public write access

Confirms that S3 buckets block public write access through both ACLs and bucket policies.

service
S3
severity
Critical
scope
evaluated once per account

How to fix it

Block public write access to the bucket.

In the console

S3 → the bucket → Permissions → Block public access (bucket settings)

With the AWS CLI

aws s3api put-public-access-block --bucket <bucket> --public-access-block-configuration BlockPublicAcls=true,BlockPublicPolicy=true,IgnorePublicAcls=true,RestrictPublicBuckets=true

With Terraform

resource "aws_s3_bucket_public_access_block" "this" {
  bucket                  = aws_s3_bucket.this.id
  block_public_acls       = true
  block_public_policy     = true
  ignore_public_acls      = true
  restrict_public_buckets = true
}

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