cis-ubuntu1604-v200-3-1-2

name	cis-ubuntu1604-v200-3-1-2
description	Ensure wireless interfaces are disabled
category	cis-networking
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","networking"]
cis_id	3.1.2
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 3.1.2

Description

Wireless networking is used when wired networks are unavailable. Debian contains a wireless tool kit to allow system administrators to configure and use wireless networks.

Rationale

If wireless is not to be used, wireless devices can be disabled to reduce the potential attack surface.

Impact

Many if not all laptop workstations and some desktop workstations will connect via wireless requiring these interfaces be enabled.

Audit Procedure

Command Line

Run the following script to verify no wireless interfaces are active on the system:

#!/bin/bash
if command -v nmcli >/dev/null 2>&1 ; then
  nmcli radio all | grep -Eq '\s*\S+\s+disabled\s+\S+\s+disabled\b' && echo "Wireless is not enabled" || nmcli radio all
elif [ -n "$(find /sys/class/net/*/ -type d -name wireless)" ]; then
  t=0
  drivers=$(for driverdir in $(find /sys/class/net/*/ -type d -name wireless | xargs -0 dirname); do basename "$(readlink -f "$driverdir"/device/driver)";done | sort -u)
  for dm in $drivers; do
    if grep -Eq "^\s*install\s+$dm\s+/bin/(true|false)" /etc/modprobe.d/*.conf; then
      /bin/true
    else
      echo "$dm is not disabled"
      t=1
    fi
  done
  [[  -eq 0 ]] &&