CloudFront Security Policy

ID: cloudfront-security-policy

Severity: medium

Author: DhiyaneshDK

Tags: cloud,devops,aws,amazon,cloudfront,aws-cloud-config

Description

Ensure that your Amazon CloudFront distributions are using a security policy with minimum TLSv1.2 or TLSv1.3 and appropriate security ciphers for HTTPS viewer connections.

YAML Source

id: cloudfront-security-policy

info:
  name: CloudFront Security Policy
  author: DhiyaneshDK
  severity: medium
  description: |
    Ensure that your Amazon CloudFront distributions are using a security policy with minimum TLSv1.2 or TLSv1.3 and appropriate security ciphers for HTTPS viewer connections.
  impact: |
    Failing to use a security policy with a minimum of TLSv1.2 or TLSv1.3 and appropriate ciphers for HTTPS viewer connections in CloudFront can expose sensitive data to interception and reduce the overall security of your application.
  remediation: |
    Configure your Amazon CloudFront distributions to use a security policy that enforces a minimum of TLSv1.2 or TLSv1.3 and specifies secure ciphers for HTTPS viewer connections.
  reference:
    - https://www.trendmicro.com/cloudoneconformity-staging/knowledge-base/aws/CloudFront/security-policy.html
    - https://aws.amazon.com/about-aws/whats-new/2017/09/amazon-cloudfront-now-lets-you-select-a-security-policy-with-minimum-tls-v1_1-1_2-and-security-ciphers-for-viewer-connections/
  tags: cloud,devops,aws,amazon,cloudfront,aws-cloud-config

variables:
  region: "us-west-2"

flow: |
  code(1)
  for(let DistributionListItemsId of iterate(template.distributions)){
    set("distribution", DistributionListItemsId)
    code(2)
  }

self-contained: true

code:
  - engine:
      - sh
      - bash

    source: |
      aws cloudfront list-distributions --output table --query 'DistributionList.Items[*].Id' --region $region --output json

    extractors:
      - type: json
        name: distributions
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash

    source: |
        aws cloudfront get-distribution --id $distribution --query 'Distribution.DistributionConfig.ViewerCertificate.MinimumProtocolVersion' --region $region --output json

    matchers:
      - type: word
        words:
          - '"TLSv1"'
          - '"TLSv1_2016"'
          - '"TLSv1.1_2016"'
          - '"TLSv1.2_2018"'
          - '"TLSv1.2_2019"'

    extractors:
      - type: dsl
        dsl:
          - '"CloudFront Uses Insecure Protocols " + distribution'
# digest: 4b0a004830460221008c2f205519658e0b52736eb47e67a7a80b97db0fbf144406765b715caa5671070221008aa467383b6f43ebd7f7d4fa6c6f609ba95fafa2790aace7099570b6c5bcd980:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "cloud/aws/cloudfront/cloudfront-security-policy.yaml"

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