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V-66647

CAT II (Medium)

The Juniper SRX Services Gateway VPN must implement a FIPS-140-2 validated Diffie-Hellman (DH) group.

Rule ID

SV-81137r1_rule

STIG

Juniper SRX SG VPN Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-000068

Discussion

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 in which the key was derived from. 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 a FIPS-validated dh-group.

[edit]
show security ike <P1-PROPOSAL-NAME>

View the IKE options dh-group option.

If the IKE option is not set to a FIPS-140-2 validated dh-group, this is a finding.

Fix Text

The following command is an example of how to configure the IKE (phase 1) proposals. The following groups are allowed for use in DoD: 
DH Groups 14 (2048-bit MODP) 
- 19 (256-bit Random ECP), 20 (384-bit Random ECP), 5 (1536-bit MODP), 24 (2048-bit MODP with 256-bit POS).

Example:
[edit]
set security ike proposal <P1-PROPOSAL-NAME> dh-group group14