The IPSec VPN must be configured to use a Diffie-Hellman (DH) Group of 14 or greater for Internet Key Exchange (IKE) Phase 1.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-207193	SRG-NET-000074-VPN-000250	SV-207193r803424_rule		High

Description
Use of an approved DH algorithm ensures the Internet Key Exchange (IKE) (Phase 1) proposal uses FIPS-validated key management techniques and processes in the production, storage, and control of private/secret cryptographic keys. The security of the DH key exchange is based on the difficulty of solving the discrete logarithm from which the key was derived. Hence, the larger the modulus, the more secure the generated key is considered to be.

Description

Use of an approved DH algorithm ensures the Internet Key Exchange (IKE) (Phase 1) proposal uses FIPS-validated key management techniques and processes in the production, storage, and control of private/secret cryptographic keys. The security of the DH key exchange is based on the difficulty of solving the discrete logarithm from which the key was derived. Hence, the larger the modulus, the more secure the generated key is considered to be.

STIG	Date
Virtual Private Network (VPN) Security Requirements Guide	2021-09-27

Details

Check Text ( C-7453r803422_chk )
Verify all IKE proposals are set to use Diffie-Hellman (DH) Group of 14 or greater for Internet Key Exchange (IKE) Phase 1. View the IKE options dh-group option. If the IKE option is not set to use Diffie-Hellman (DH) Group of 14 or greater for Internet Key Exchange (IKE) Phase 1, this is a finding.

Fix Text (F-7453r803423_fix)
Configure the IPsec VPN to use the Diffie-Hellman (DH) Group of 14 or greater for Internet Key Exchange (IKE) Phase 1.