AOS, when used as a VPN Gateway, must be configured to use IPsec with SHA-2 at 384 bits or greater for hashing to protect the integrity of remote access sessions.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-266983 | SRG-NET-000063-VPN-000220 | ARBA-VN-000220 | SV-266983r1040715_rule | 2024-10-29 | 1 |
| Description |
|---|
| Without strong cryptographic integrity protections, information can be altered by unauthorized users without detection. SHA-1 is considered a compromised hashing standard and is being phased out of use by industry and government standards. DOD systems must not be configured to use SHA-1 for integrity of remote access sessions. The remote access VPN provides access to DOD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Satisfies: SRG-NET-000063-VPN-000220, SRG-NET-000074-VPN-000250, SRG-NET-000168-VPN-000600, SRG-NET-000230-VPN-000780 |
| ℹ️ Check |
|---|
| 1. Verify the AOS configuration with the following command: show crypto-local ipsec-map Note the IKEv2 Policy number for each configured map. 2. For each configured policy number, run the following command: show crypto isakmp policy <IKEv2 Policy #> If each configured IKEv2 policy hash algorithm is not configured with SHA-2 at 384 bit, this is a finding. |
| ✔️ Fix |
|---|
| Configure AOS with the following commands: configure terminal crypto isakmp policy <priority> hash sha2-384-192 exit write memory |