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Basé sur la classification professionnelle SOC
Affichage de SKILL.md
| name | cis-ubuntu1804-v220-3-4-2-6 |
| description | Ensure nftables loopback traffic is configured |
| category | cis-networking |
| version | 2.2.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","networking","firewall","nftables"] |
| cis_id | 3.4.2.6 |
| cis_benchmark | CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Configure the loopback interface to accept traffic. Configure all other interfaces to deny traffic to the loopback network.
Loopback traffic is generated between processes on machine and is typically critical to operation of the system. The loopback interface is the only place that loopback network traffic should be seen, all other interfaces should ignore traffic on this network as an anti-spoofing measure.
None.
Run the following commands to verify that the loopback interface is configured:
Run the following command to verify the loopback interface is configured to accept network traffic:
nft list ruleset | awk '/hook input/,/}/' | grep 'iif "lo" accept'
Example output:
iif "lo" accept
Run the following command to verify network traffic from an IPv4 loopback interface is configured to drop:
nft list ruleset | awk '/hook input/,/}/' | grep 'ip saddr'
Example output:
ip saddr 127.0.0.0/8 counter packets 0 bytes 0 drop
-IF- IPv6 is enabled on the system: Run the following command to verify network traffic from an IPv6 loopback interface is configured to drop:
nft list ruleset | awk '/hook input/,/}/' | grep 'ip6 saddr'
Example output:
ip6 saddr ::1 counter packets 0 bytes 0 drop
The loopback interface should accept traffic, and traffic from 127.0.0.0/8 (and ::1 for IPv6) should be dropped.
Run the following commands to implement the loopback rules:
nft add rule inet filter input iif lo accept
nft add rule inet filter input ip saddr 127.0.0.0/8 counter drop
-IF- IPv6 is enabled on the system: Run the following command to implement the IPv6 loopback rule:
nft add rule inet filter input ip6 saddr ::1 counter drop
No loopback rules are configured by default.
Version 8
4.4 Implement and Manage a Firewall on Servers - Implement and manage a firewall on servers, where supported.
4.5 Implement and Manage a Firewall on End-User Devices - Implement and manage a host-based firewall or port-filtering tool on end-user devices.
Version 7
9.4 Apply Host-based Firewalls or Port Filtering - Apply host-based firewalls or port filtering tools on end systems, with a default-deny rule that drops all traffic except those services and ports that are explicitly allowed.
Automated