Disable tftp Service

An XCCDF Rule

Description

The tftp service should be disabled. The tftp service can be disabled with the following command:

$ sudo systemctl mask --now tftp.service

Rationale

Disabling the tftp service ensures the system is not acting as a TFTP server, which does not provide encryption or authentication.

ID: xccdf_org.ssgproject.content_rule_service_tftp_disabled
Severity: High
References: 11 12 14 15 3 8 9

APO13.01 BAI10.01 BAI10.02 BAI10.03 BAI10.05 DSS01.04 DSS05.02 DSS05.03 DSS05.05 DSS06.06

CCI-001436

4.3.3.5.1 4.3.3.5.2 4.3.3.5.3 4.3.3.5.4 4.3.3.5.5 4.3.3.5.6 4.3.3.5.7 4.3.3.5.8 4.3.3.6.1 4.3.3.6.2 4.3.3.6.3 4.3.3.6.4 4.3.3.6.5 4.3.3.6.6 4.3.3.6.7 4.3.3.6.8 4.3.3.6.9 4.3.3.7.1 4.3.3.7.2 4.3.3.7.3 4.3.3.7.4 4.3.4.3.2 4.3.4.3.3

SR 1.1 SR 1.10 SR 1.11 SR 1.12 SR 1.13 SR 1.2 SR 1.3 SR 1.4 SR 1.5 SR 1.6 SR 1.7 SR 1.8 SR 1.9 SR 2.1 SR 2.2 SR 2.3 SR 2.4 SR 2.5 SR 2.6 SR 2.7 SR 3.1 SR 3.5 SR 3.8 SR 4.1 SR 4.3 SR 5.1 SR 5.2 SR 5.3 SR 7.1 SR 7.6

A.11.2.6 A.12.1.2 A.12.5.1 A.12.6.2 A.13.1.1 A.13.2.1 A.14.1.3 A.14.2.2 A.14.2.3 A.14.2.4 A.6.2.1 A.6.2.2 A.9.1.2

CM-6(a) CM-7(a) CM-7(b)

PR.AC-3 PR.IP-1 PR.PT-3 PR.PT-4

CCE-80212-4

2.2.16
Updated: over 1 year ago

Remediation Templates

- name: Block Disable service tftp
  block:
  - name: Disable service tftp
    block:

    - name: Disable service tftp      systemd:
        name: tftp.service
        enabled: 'no'
        state: stopped
        masked: 'yes'
    rescue:

    - name: Intentionally ignored previous 'Disable service tftp' failure, service
        was already disabled
      meta: noop
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CCE-80212-4
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - high_severity
  - low_complexity
  - low_disruption
  - no_reboot_needed
  - service_tftp_disabled

- name: Unit Socket Exists - tftp.socket
  command: systemctl -q list-unit-files tftp.socket
  register: socket_file_exists
  changed_when: false
  failed_when: socket_file_exists.rc not in [0, 1]
  check_mode: false
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CCE-80212-4
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - high_severity
  - low_complexity
  - low_disruption
  - no_reboot_needed
  - service_tftp_disabled

- name: Disable socket tftp
  systemd:
    name: tftp.socket
    enabled: 'no'
    state: stopped
    masked: 'yes'
  when:
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  - socket_file_exists.stdout_lines is search("tftp.socket",multiline=True)
  tags:
  - CCE-80212-4
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - high_severity
  - low_complexity
  - low_disruption
  - no_reboot_needed
  - service_tftp_disabled

[customizations.services]
disabled = ["tftp"]

include disable_tftp
class disable_tftp {
  service {'tftp':
    enable => false,
    ensure => 'stopped',
  }
}

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then
SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" stop 'tftp.service'
"$SYSTEMCTL_EXEC" disable 'tftp.service'
"$SYSTEMCTL_EXEC" mask 'tftp.service'# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files tftp.socket; then
    "$SYSTEMCTL_EXEC" stop 'tftp.socket'
    "$SYSTEMCTL_EXEC" mask 'tftp.socket'
fi
# The service may not be running because it has been started and failed,
# so let's reset the state so OVAL checks pass.
# Service should be 'inactive', not 'failed' after reboot though.
"$SYSTEMCTL_EXEC" reset-failed 'tftp.service' || true

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
spec:
  config:
    ignition:
      version: 3.1.0    systemd:
      units:
      - name: tftp.service
        enabled: false
        mask: true
      - name: tftp.socket
        enabled: false
        mask: true

Disable tftp Service

Description

Rationale

Remediation Templates

An Ansible Snippet

OS Build Blueprint

A Puppet Snippet

A Shell Script

A Kubernetes Patch