FNFG-FW-000075 - The FortiGate firewall implementation must manage excess bandwidth to limit the effects of packet flooding types of denial-of-service (DoS) attacks.

Information

A firewall experiencing a DoS attack will not be able to handle production traffic load. The high utilization and CPU caused by a DoS attack will also have an effect on control keep-alives and timers used for neighbor peering resulting in route flapping and will eventually black hole production traffic.

The device must be configured to contain and limit a DoS attack's effect on the device's resource utilization. The use of redundant components and load balancing are examples of mitigating 'flood-type' DoS attacks through increased capacity.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

Log in to the FortiGate GUI with Super-Admin privilege.

1. Click Policy and Objects.
2. Click IPv4 DoS Policy or IPv6 DoS Policy.
3. Click +Create New.
4. Select the Incoming Interface.
5. Select Source and Destination addresses.
6. Select the Service.
7. Enable desired L3 and L4 anomalies and thresholds.
8. Ensure the Enable this policy is toggle to right.
9. Click OK.
10. Ensure a policy is created for each interface where there is potential risk of DoS.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_FN_FortiGate_Firewall_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5(2), CAT|II, CCI|CCI-001095, Rule-ID|SV-234146r628776_rule, STIG-ID|FNFG-FW-000075, Vuln-ID|V-234146

Plugin: FortiGate

Control ID: 1a0ad73d1d73e13bf67ebb5e6d973bacc269bcabe2ddae722e087ee0391fa86b