The Cisco ASA must be configured to use FIPS-validated SHA-2 at 384 bits or higher for Internet Key Exchange (IKE) Phase 1.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-239958 | CASA-VN-000230 | SV-239958r916134_rule | CCI-000803 | medium |
| Description | ||||
| Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Although allowed by SP800-131Ar2 for some applications, SHA-1 is considered a compromised hashing standard and is being phased out of use by industry and government standards. Unless required for legacy use, DOD systems should not be configured to use SHA-2 for integrity of remote access sessions. | ||||
| STIG | Date | |||
| Cisco ASA VPN Security Technical Implementation Guide | 2024-08-22 | |||
Details
Check Text (C-239958r916134_chk)
Review the ASA configuration to verify that SHA-2 at 384 bits or higher is specified for IKE Phase 1 as shown in the example below.
crypto ikev2 policy 1
…
integrity sha384
If the ASA is not configured to use SHA-2 at 384 bits or higher for IKE Phase 1, this is a finding.
Fix Text (F-43150r916133_fix)
Configure the ASA to use FIPS-validated SHA-2 at 384 bits or higher for IKE Phase 1 as shown in the example below.
ASA2(config)# crypto ikev2 policy 1
ASA2(config-ikev2-policy)# integrity sha384