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CloudFront distribution origin is not set to S3 or origin protocol policy is not set to https-only Affecting CloudFront service in AWS

0.0
high
    Severity Framework Snyk CCSS
    Rule category Data / Encryption in Transit

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    Frameworks
    AWS-Well-Architected CIS-Controls CSA-CCM HIPAA ISO-27001 NIST-800-53 PCI-DSS SOC-2
  • Snyk ID SNYK-CC-00146
  • credit Snyk Research Team
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Description

CloudFront connections should be encrypted during transmission over networks that can be accessed by malicious individuals. If a CloudFront distribution uses a custom origin, CloudFront should only use HTTPS to communicate with it. This does not apply if the CloudFront distribution is configured to use S3 as origin.

How to fix?

Set the origin block with a valid domain_name attribute or custom_origin_config block.

Valid values:

  • S3 origin: A domain_name attribute that ends in s3.amazonaws.com or references an aws_s3_bucket resource
  • Custom origin: A custom_origin_config block with an origin_protocol_policy attribute set to https-only

Example Configuration

# S3 as origin
resource "aws_cloudfront_distribution" "s3_distribution" {
  origin {
    domain_name = "${aws_s3_bucket.b.bucket_regional_domain_name}"
    origin_id   = "${aws_s3_bucket.b.id}"

    s3_origin_config {
      origin_access_identity = "${aws_cloudfront_origin_access_identity.origin_access_identity.cloudfront_access_identity_path}"
    }
  }

  enabled = true
  
  restrictions {
    geo_restriction {
      restriction_type = "whitelist"
      locations        = ["US", "CA", "GB", "DE"]
    }
  }

  viewer_certificate {
    cloudfront_default_certificate = true
  }

  default_cache_behavior {
    allowed_methods  = ["DELETE", "GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT"]
    cached_methods   = ["GET", "HEAD"]
    target_origin_id = "${aws_s3_bucket.b.id}"

    forwarded_values {
      query_string = false

      cookies {
        forward = "none"
      }
    }

    viewer_protocol_policy = "redirect-to-https"
    min_ttl                = 0
    default_ttl            = 3600
    max_ttl                = 86400
  }
}

# Custom origin
resource "aws_cloudfront_distribution" "s3_distribution" {
  origin {
    domain_name = "example.com"
    origin_id   = "${local.origin_id}"

    custom_origin_config {
      http_port = "80"
      https_port = "443"
      origin_ssl_protocols = ["SSLv3", "TLSv1", "TLSv1.1", "TLSv1.2"]
      origin_protocol_policy = "https-only"
    }
  }

  enabled = true
  
  restrictions {
    geo_restriction {
      restriction_type = "whitelist"
      locations        = ["US", "CA", "GB", "DE"]
    }
  }

  viewer_certificate {
    cloudfront_default_certificate = true
  }

  default_cache_behavior {
    allowed_methods  = ["DELETE", "GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT"]
    cached_methods   = ["GET", "HEAD"]
    target_origin_id = "${local.origin_id}"

    forwarded_values {
      query_string = false

      cookies {
        forward = "none"
      }
    }

    viewer_protocol_policy = "redirect-to-https"
    min_ttl                = 0
    default_ttl            = 3600
    max_ttl                = 86400
  }
}

References