AOS, when used as a VPN Gateway, must uniquely identify all network-connected endpoint devices before establishing a connection.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-266987	SRG-NET-000148-VPN-000540	ARBA-VN-000540	SV-266987r1040727_rule	2024-10-29	1

Description
Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For distributed architectures (e.g., service-oriented architectures), the decisions regarding the validation of identification claims may be made by services separate from the services acting on those decisions. In such situations, it is necessary to provide the identification decisions (as opposed to the actual identifiers) to the services that need to act on those decisions. This requirement applies to applications that connect locally, remotely, or through a network to an endpoint device (including, but not limited to, workstations, printers, servers outside a datacenter, Voice Over Internet Protocol [VoIP] phones, and video teleconference codecs). Gateways and service-oriented architecture (SOA) applications are examples of where this requirement would apply.

Description

Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For distributed architectures (e.g., service-oriented architectures), the decisions regarding the validation of identification claims may be made by services separate from the services acting on those decisions. In such situations, it is necessary to provide the identification decisions (as opposed to the actual identifiers) to the services that need to act on those decisions. This requirement applies to applications that connect locally, remotely, or through a network to an endpoint device (including, but not limited to, workstations, printers, servers outside a datacenter, Voice Over Internet Protocol [VoIP] phones, and video teleconference codecs). Gateways and service-oriented architecture (SOA) applications are examples of where this requirement would apply.

ℹ️ Check
Verify the AOS configuration with the following command: 1. Site-to-site VPN: Using the CLI: show crypto isakmp sa If the IPsec security association is not operating with certificates ("-c"), this is a finding. 2. Hardware client VPN: Using the web GUI, navigate to Configuration >> Access Points >> Remote APs. Review each provisioned Remote Access Point (RAP) and verify that each AP has "c" in the FLAGS column. If certificate authentication is not configured for each RAP, this is a finding.

ℹ️ Check

Verify the AOS configuration with the following command: 1. Site-to-site VPN: Using the CLI: show crypto isakmp sa If the IPsec security association is not operating with certificates ("-c"), this is a finding. 2. Hardware client VPN: Using the web GUI, navigate to Configuration >> Access Points >> Remote APs. Review each provisioned Remote Access Point (RAP) and verify that each AP has "c" in the FLAGS column. If certificate authentication is not configured for each RAP, this is a finding.

✔️ Fix
Configure AOS using the web interface: 1. Navigate to Configuration >> Services >> VPN and expand "Site-to-Site". 2. Select the configured site-to-site VPN IPsec maps. Select the applicable Server certificate. Select the applicable trusted DOD root CA under "CA certificate:". 3. Click Submit >> Pending Changes >> Deploy Changes. 4. Navigate to Configuration >> Access Points >> Remote APs tab. 5. Select the check box next to the AP Name in the Remote AP table and click "Provision". 6. In the "General" tab, select "Certificate" from the "Authentication method:" drop-down list. 7. Click "Submit" to apply the configuration and reboot the AP as a certificate Remote AP. 8. Click Pending Changes >> Deploy Changes.

✔️ Fix

Configure AOS using the web interface: 1. Navigate to Configuration >> Services >> VPN and expand "Site-to-Site". 2. Select the configured site-to-site VPN IPsec maps. Select the applicable Server certificate. Select the applicable trusted DOD root CA under "CA certificate:". 3. Click Submit >> Pending Changes >> Deploy Changes. 4. Navigate to Configuration >> Access Points >> Remote APs tab. 5. Select the check box next to the AP Name in the Remote AP table and click "Provision". 6. In the "General" tab, select "Certificate" from the "Authentication method:" drop-down list. 7. Click "Submit" to apply the configuration and reboot the AP as a certificate Remote AP. 8. Click Pending Changes >> Deploy Changes.