Kerülő megoldás (CNA)
Disable the EAP-FAST submodule in the FreeRADIUS configuration, or restrict incoming RADIUS traffic to trusted network access points.
1. Disable EAP-FAST:
In `/etc/raddb/mods-available/eap` (or `/etc/raddb/eap.conf`), comment out the `fast` section within the `eap` configuration block and verify that `default_eap_type` is not set to `fast`.
2. Apply configuration changes:
```
systemctl restart radiusd
```
3. Limit network exposure:
Restrict UDP port 1812 to authorized Network Access Server (NAS) clients using firewalld:
```
firewall-cmd --permanent --zone=internal --add-source=<TRUSTED_IP_OR_SUBNET>
firewall-cmd --permanent --zone=internal --add-port=1812/udp
firewall-cmd --reload
```
Caveats:
Disabling EAP-FAST prevents authentication for any network clients that rely exclusively on EAP-FAST. Restricting firewall rules will block traffic from unlisted authenticator sources.
Warning:
Restarting or reloading the radiusd service will temporarily disrupt active RADIUS authentication processing.