AOS, when used as a VPN Gateway, must use an approved Commercial Solution for Classified (CSfC) when transporting classified traffic across an unclassified network.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-266986	SRG-NET-000352-VPN-001460	ARBA-VN-001460	SV-266986r1040894_rule	2024-10-29	1

Description
Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The National Security Agency/Central Security Service's (NSA/CSS) CSfC program enables commercial products to be used in layered solutions to protect classified National Security Systems (NSS) data. Currently, Suite B cryptographic algorithms are specified by the National Institute of Standards and Technology (NIST) and are used by the NSA's Information Assurance Directorate in solutions approved for protecting classified and unclassified NSS. However, quantum-resistant algorithms will be required for future required Suite B implementations. Satisfies: SRG-NET-000352-VPN-001460, SRG-NET-000565-VPN-002390, SRG-NET-000565-VPN-002400

Description

Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The National Security Agency/Central Security Service's (NSA/CSS) CSfC program enables commercial products to be used in layered solutions to protect classified National Security Systems (NSS) data. Currently, Suite B cryptographic algorithms are specified by the National Institute of Standards and Technology (NIST) and are used by the NSA's Information Assurance Directorate in solutions approved for protecting classified and unclassified NSS. However, quantum-resistant algorithms will be required for future required Suite B implementations. Satisfies: SRG-NET-000352-VPN-001460, SRG-NET-000565-VPN-002390, SRG-NET-000565-VPN-002400

ℹ️ Check
If AOS is not being used for CSFC, this requirement is not applicable. 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 #> 3. Verify each configured transform-set by running the following command: show crypto ipsec transform-set If the configured IPsec map, ISAKMP policy, and transform-set do not contain the following, this is a finding: ECDCA 384 certificate IKEv2 policy with AES256, SHA-384, ECDSA-384, Group 20 Transform set with AES-256-GCM

ℹ️ Check

If AOS is not being used for CSFC, this requirement is not applicable. 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 #> 3. Verify each configured transform-set by running the following command: show crypto ipsec transform-set If the configured IPsec map, ISAKMP policy, and transform-set do not contain the following, this is a finding: ECDCA 384 certificate IKEv2 policy with AES256, SHA-384, ECDSA-384, Group 20 Transform set with AES-256-GCM

✔️ Fix
Configure AOS with the following commands: 1. crypto pki csr ec curve_name secp384r1 common_name <common_name> country <US> state_or_province <state> city <city> organization <org> unit <unit> email <email> show crypto pki csr 2. Use DOD PKI to generate a public certificate based on the CSR. 3. Using the web GUI, navigate to Configuration >> System >> Certificates >> Import Certificates. 4. Click the plus sign (+) and enter "Certificate name:", browse to the public certificate file, choose the appropriate format, "ServerCert" type, and click "Submit". 5. Navigate to Configuration >> System >> Admin and choose the imported certificate under "Server Certificate" and click "Submit". 6. Click Pending Changes >> Deploy Changes. configure terminal crypto ipsec transform-set <name> esp-aes256-gcm crypto isakmp policy <#> authentication ecdsa-384 encryption aes256 group 20 hash sha2-384-192 prf prf-hmac-sha384 version v2 exit crypto-local ipsec-map <name> <priority> set transform-set <set created earlier name> <configure VPN settings as needed> exit write memory

✔️ Fix

Configure AOS with the following commands: 1. crypto pki csr ec curve_name secp384r1 common_name <common_name> country <US> state_or_province <state> city <city> organization <org> unit <unit> email <email> show crypto pki csr 2. Use DOD PKI to generate a public certificate based on the CSR. 3. Using the web GUI, navigate to Configuration >> System >> Certificates >> Import Certificates. 4. Click the plus sign (+) and enter "Certificate name:", browse to the public certificate file, choose the appropriate format, "ServerCert" type, and click "Submit". 5. Navigate to Configuration >> System >> Admin and choose the imported certificate under "Server Certificate" and click "Submit". 6. Click Pending Changes >> Deploy Changes. configure terminal crypto ipsec transform-set <name> esp-aes256-gcm crypto isakmp policy <#> authentication ecdsa-384 encryption aes256 group 20 hash sha2-384-192 prf prf-hmac-sha384 version v2 exit crypto-local ipsec-map <name> <priority> set transform-set <set created earlier name> <configure VPN settings as needed> exit write memory