cyberstrikeus CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 - Control 4.3.1
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 &>/dev/null && echo "nftables is installed"
Expected Result
nftables is installed
Remediation
Command Line
Run the following command to install nftables:
apt install nftables
Default Value
Not applicable.
References
- NIST SP 800-53 Rev. 5: CA-9
CIS Controls
v8 - 4.4 Implement and Manage a Firewall on Servers v8 - 4.5 Implement and Manage a Firewall on End-User Devices v7 - 9.4 Apply Host-based Firewalls or Port Filtering
MITRE ATT&CK Mappings: T1562, T1562.004 | TA0011 | M1031, M1037