Title

The IPSec VPN must be configured to use a Diffie-Hellman (DH) Group of 16 or greater for Internet Key Exchange (IKE) Phase 1. (Cat I impact)

Discussion

Use of an approved DH algorithm ensures the 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.

Check Content

Verify all IKE proposals are set to use DH Group of 16 or greater for IKE Phase 1. View the IKE options dh-group option. If the IKE option is not set to use DH Group of 16 or greater for IKE Phase 1, this is a finding.

Fix Text

Configure the IPsec VPN to use the DH Group of 16 or greater for IKE Phase 1.

Additional Identifiers

Rule ID: SV-207193r916149_rule

Vulnerability ID: V-207193

Group Title: SRG-NET-000074

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.