📝 AWS CloudFront Web Distribution uses Dedicated IP for SSL 🟢

• Contextual name: 📝 Web Distribution uses Dedicated IP for SSL 🟢
• ID: /ce/ca/aws/cloudfront/distribution-uses-dedicated-ip
• Located in: 📁 AWS CloudFront

Flags

• 🟢 Policy with categories
• 🟢 Policy with type
• 🟢 Production policy

Our Metadata

• Policy Type: COMPLIANCE_POLICY
• Policy Category:
  • COST
  • RELIABILITY

Similar Policies

• AWS Security Hub
  • [[CloudFront.8] CloudFront distributions should use SNI to serve HTTPS requests]([CloudFront.8] CloudFront distributions should use SNI to serve HTTPS requests (https://docs.aws.amazon.com/securityhub/latest/userguide/cloudfront-controls.html#cloudfront-8)]
• Internal
  • dec-x-92f3cecf

Similar Internal Rules

Rule	Policies	Flags
✉️ dec-x-92f3cecf	1

Logic

• 🧠 prod.logic.yaml 🟢
  • 📗 AWS CloudFront Distribution
  • 🔌 AWS CloudFront Distribution - object.extracts.yaml
  • 🧪 test-data.json

Description

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Description

This policy checks that AWS CloudFront Web Distributions use a custom SSL certificate configured with Server Name Indication (SNI) extension for handling HTTPS traffic.

Rationale

When CloudFront is configured to serve HTTPS requests using dedicated IP addresses, AWS imposes additional monthly charges. These charges apply as soon as a custom SSL/TLS certificate is associated with a distribution and the distribution is enabled.

The Server Name Indication (SNI) extension to the TLS protocol allows CloudFront to deliver HTTPS traffic without relying on dedicated IP addresses. When using SNI, CloudFront assigns an IP address to each edge location. During the SSL/TLS handshake, the client includes the domain name in the SNI extension, allowing CloudFront to select the appropriate certificate. DNS then routes the request to the IP address of the corresponding edge location.

Impact

SNI is supported by all modern browsers and HTTP clients released since 2010. Older clients lacking SNI support may fail to establish HTTPS connections, representing a compatibility risk for legacy environments.

... see more

Remediation

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Remediation

From Command Line

1. Retrieve the current distribution configuration and capture its ETag:

   aws cloudfront get-distribution-config \
       --id {{distribution-id}} \
       --query 'DistributionConfig' \
       > {{distribution-config}}.json
   
   ETAG=$(aws cloudfront get-distribution-config \
       --id {{distribution-id}} \
       --query 'ETag' \
       --output text)

2. In the downloaded {{distribution-config}}.json, modify the ViewerCertificate structure and set the SSLSupportMethod key to sni-only.

3. Apply the updated configuration to your distribution using the saved ETag:

   aws cloudfront update-distribution \
       --id {{distribution-id}} \
       --if-match $ETAG \
       --distribution-config file://{{distribution-config}}.json

policy.yaml

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Linked Framework Sections

Section	Sub Sections	Internal Rules	Policies	Flags
💼 AWS Foundational Security Best Practices v1.0.0 → 💼 [CloudFront.8] CloudFront distributions should use SNI to serve HTTPS requests		1	1
💼 Cloudaware Framework → 💼 Resource Optimization			5
💼 Cloudaware Framework → 💼 System Configuration			30
💼 FedRAMP High Security Controls → 💼 AC-4 Information Flow Enforcement (M)(H)	2	36	75
💼 FedRAMP High Security Controls → 💼 AC-17(2) Protection of Confidentiality and Integrity Using Encryption (M)(H)			17
💼 FedRAMP High Security Controls → 💼 CM-2 Baseline Configuration (L)(M)(H)	3	1	24
💼 FedRAMP High Security Controls → 💼 IA-5(1) Password-based Authentication (L)(M)(H)		1	8
💼 FedRAMP High Security Controls → 💼 SC-7(4) External Telecommunications Services (M)(H)			25
💼 FedRAMP High Security Controls → 💼 SC-8 Transmission Confidentiality and Integrity (L)(M)(H)	1	8	17
💼 FedRAMP High Security Controls → 💼 SC-8(1) Cryptographic Protection (L)(M)(H)		8	16
💼 FedRAMP High Security Controls → 💼 SC-13 Cryptographic Protection (L)(M)(H)		16	24
💼 FedRAMP High Security Controls → 💼 SC-23 Session Authenticity (M)(H)		7	13
💼 FedRAMP Low Security Controls → 💼 CM-2 Baseline Configuration (L)(M)(H)			23
💼 FedRAMP Low Security Controls → 💼 IA-5(1) Password-based Authentication (L)(M)(H)			8
💼 FedRAMP Low Security Controls → 💼 SC-8 Transmission Confidentiality and Integrity (L)(M)(H)	1		17
💼 FedRAMP Low Security Controls → 💼 SC-8(1) Cryptographic Protection (L)(M)(H)			16
💼 FedRAMP Low Security Controls → 💼 SC-13 Cryptographic Protection (L)(M)(H)			24
💼 FedRAMP Moderate Security Controls → 💼 AC-4 Information Flow Enforcement (M)(H)	1		60
💼 FedRAMP Moderate Security Controls → 💼 AC-17(2) Protection of Confidentiality and Integrity Using Encryption (M)(H)			17
💼 FedRAMP Moderate Security Controls → 💼 CM-2 Baseline Configuration (L)(M)(H)	3		24
💼 FedRAMP Moderate Security Controls → 💼 IA-5(1) Password-based Authentication (L)(M)(H)			8
💼 FedRAMP Moderate Security Controls → 💼 SC-7(4) External Telecommunications Services (M)(H)			25
💼 FedRAMP Moderate Security Controls → 💼 SC-8 Transmission Confidentiality and Integrity (L)(M)(H)	1		17
💼 FedRAMP Moderate Security Controls → 💼 SC-8(1) Cryptographic Protection (L)(M)(H)			16
💼 FedRAMP Moderate Security Controls → 💼 SC-13 Cryptographic Protection (L)(M)(H)			24
💼 FedRAMP Moderate Security Controls → 💼 SC-23 Session Authenticity (M)(H)			13
💼 NIST CSF v2.0 → 💼 DE.CM-09: Computing hardware and software, runtime environments, and their data are monitored to find potentially adverse events			134
💼 NIST CSF v2.0 → 💼 ID.AM-03: Representations of the organization's authorized network communication and internal and external network data flows are maintained			45
💼 NIST CSF v2.0 → 💼 PR.DS-01: The confidentiality, integrity, and availability of data-at-rest are protected			114
💼 NIST CSF v2.0 → 💼 PR.DS-02: The confidentiality, integrity, and availability of data-in-transit are protected			94
💼 NIST CSF v2.0 → 💼 PR.DS-10: The confidentiality, integrity, and availability of data-in-use are protected			108
💼 NIST CSF v2.0 → 💼 PR.IR-01: Networks and environments are protected from unauthorized logical access and usage			66
💼 NIST SP 800-53 Revision 5 → 💼 AC-4 Information Flow Enforcement	32	68	85
💼 NIST SP 800-53 Revision 5 → 💼 AC-17(2) Remote Access _ Protection of Confidentiality and Integrity Using Encryption		12	17
💼 NIST SP 800-53 Revision 5 → 💼 CA-9(1) Internal System Connections _ Compliance Checks			20
💼 NIST SP 800-53 Revision 5 → 💼 CM-2 Baseline Configuration	7		23
💼 NIST SP 800-53 Revision 5 → 💼 IA-5(1) Authenticator Management _ Password-based Authentication			8
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(4) Boundary Protection _ External Telecommunications Services			25
💼 NIST SP 800-53 Revision 5 → 💼 SC-8 Transmission Confidentiality and Integrity	5	8	16
💼 NIST SP 800-53 Revision 5 → 💼 SC-8(1) Transmission Confidentiality and Integrity _ Cryptographic Protection		8	15
💼 NIST SP 800-53 Revision 5 → 💼 SC-8(2) Transmission Confidentiality and Integrity _ Pre- and Post-transmission Handling			7
💼 NIST SP 800-53 Revision 5 → 💼 SC-12(3) Cryptographic Key Establishment and Management _ Asymmetric Keys			6
💼 NIST SP 800-53 Revision 5 → 💼 SC-13 Cryptographic Protection	4		13
💼 NIST SP 800-53 Revision 5 → 💼 SC-23 Session Authenticity	5		7
💼 NIST SP 800-53 Revision 5 → 💼 SC-23(3) Session Authenticity _ Unique System-generated Session Identifiers			6
💼 NIST SP 800-53 Revision 5 → 💼 SI-7(6) Software, Firmware, and Information Integrity _ Cryptographic Protection			12
💼 PCI DSS v3.2.1 → 💼 4.1 Use strong cryptography and security protocols to safeguard sensitive cardholder data during transmission over open, public networks.	1	8	21
💼 PCI DSS v4.0.1 → 💼 4.2.1 Strong cryptography and security protocols are implemented to safeguard PAN during transmission over open, public networks.	2		21
💼 PCI DSS v4.0 → 💼 4.2.1 Strong cryptography and security protocols are implemented to safeguard PAN during transmission over open, public networks.	2	9	21