cyberstrikeus CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 3.5.2.1
Profile
- Level: Level 1 - Server, Level 1 - Workstation
- Assessment Status: Automated
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 queuing and logging subsystem.
Notes:
- nftables is available in Linux kernel 3.13 and newer.
- Only one firewall utility should be installed and configured.
- Changing firewall settings while connected over the network can result in being locked out of the system.
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.
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 nftables
References
None
CIS Controls
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.