cis-ubuntu1804-v220-3-1-2

DevOps & Security

Ensure wireless interfaces are disabled

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CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 - Control 3.1.2

Description

Wireless networking is used when wired networks are unavailable.

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 wireless interfaces be enabled.

Audit Procedure

Command Line

Run the following script to verify wireless interfaces are disabled:

#!/usr/bin/bash
{
  if command -v nmcli >/dev/null 2>&1 ; then
    if nmcli radio all | grep -Eq '\s*\S+\s+disabled\s+\S+\s+disabled\b'; then
      echo "Wireless is not enabled"
    else
      nmcli radio all
    fi
  elif [ -n "$(find /sys/class/net/*/ -type d -name wireless)" ]; then
    t=0
    mession=$(for dession in $(find /sys/class/net/*/ -type d -name wireless | xargs -I{} dirname {}); do
      basename "$dession"
    done)
    for l_wireless in $mession; do
      echo "Wireless interface \"$l_wireless\" is active"
      t=1
    done
  else
    echo "Wireless is not enabled"
  fi
}

Expected Result

Wireless is not enabled

Remediation

Command Line

Run the following command to disable wireless interfaces:

nmcli radio all off

If the system does not have nmcli, disable all wireless interfaces by unloading the kernel module for the wireless adapter or by using ip link set <interface> down for each wireless interface.

Default Value

Wireless interfaces are enabled by default.

References

NIST SP 800-53 Rev. 5: CM-7, SC-7
CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0

CIS Controls

Version 8

4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software - Uninstall or disable unnecessary services on enterprise assets and software.

Version 7

15.4 Ensure Each Wireless Device Connected to the Network Matches an Authorized Configuration and Security Profile - Ensure that every wireless device connected to the network matches an authorized configuration and security profile, with a documented owner of the connection.

15.5 Limit Wireless Access on Client Devices - Configure wireless access on client machines that do have an essential wireless business purpose, to allow access only to authorized wireless networks.

Profile Applicability

Level 1 - Server

Assessment Status

Automated