Imported from nadamohamed14796-byte/cyber-strike (
.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/cis-ubuntu-linux-18-04-lts-benchmark-v2/cis-ubuntu1804-v220-3-4-2-1/SKILL.md). Install upstream withnpx skills add nadamohamed14796-byte/cyber-strike --skill cis-ubuntu1804-v220-3-4-2-1. Copyright stays with the author.
CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 - Control 3.4.2.1
Description
nftables provides a new in-kernel packet classification framework that is based on a network-specific Virtual Machine (VM) and a new nft userspace command line tool. nftables reuses the existing Netfilter subsystems such as the existing hook infrastructure, the connection tracking system, NAT, userspace queueing component and logging subsystem.
Rationale
nftables is a subsystem of the Linux kernel that can protect against threats originating from within a corporate network to include malicious mobile code and poorly configured software on a host.
Impact
None.
Audit Procedure
Command Line
Run the following command to verify that nftables is installed:
dpkg-query -s nftables | grep 'Status: install ok installed'Expected Result
Status: install ok installed
Remediation
Command Line
Run the following command to install nftables:
apt install nftablesDefault Value
nftables is not installed by default.
References
- NIST SP 800-53 Rev. 5: CA-9, SC-7
- CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0
CIS Controls
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.
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Assessment Status
Automated
