Disable Ctrl-Alt-Del Reboot Activation

An XCCDF Rule

Description

By default, SystemD will reboot the system if the Ctrl-Alt-Del key sequence is pressed.

To configure the system to ignore the Ctrl-Alt-Del key sequence from the command line instead of rebooting the system, do either of the following:

ln -sf /dev/null /etc/systemd/system/ctrl-alt-del.target

systemctl mask ctrl-alt-del.target

Do not simply delete the /usr/lib/systemd/system/ctrl-alt-del.service file, as this file may be restored during future system updates.

Rationale

A locally logged-in user who presses Ctrl-Alt-Del, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot.

ID: xccdf_org.ssgproject.content_rule_disable_ctrlaltdel_reboot
Severity: High
References: 12 13 14 15 16 18 3 5

APO01.06 DSS05.04 DSS05.07 DSS06.02

3.4.5

CCI-000366

164.308(a)(1)(ii)(B) 164.308(a)(7)(i) 164.308(a)(7)(ii)(A) 164.310(a)(1) 164.310(a)(2)(i) 164.310(a)(2)(ii) 164.310(a)(2)(iii) 164.310(b) 164.310(c) 164.310(d)(1) 164.310(d)(2)(iii)

4.3.3.7.3

SR 2.1 SR 5.2

A.10.1.1 A.11.1.4 A.11.1.5 A.11.2.1 A.13.1.1 A.13.1.3 A.13.2.1 A.13.2.3 A.13.2.4 A.14.1.2 A.14.1.3 A.6.1.2 A.7.1.1 A.7.1.2 A.7.3.1 A.8.2.2 A.8.2.3 A.9.1.1 A.9.1.2 A.9.2.3 A.9.4.1 A.9.4.4 A.9.4.5

CIP-003-8 R5.1.1 CIP-003-8 R5.3 CIP-004-6 R2.3 CIP-007-3 R2.1 CIP-007-3 R2.2 CIP-007-3 R2.3 CIP-007-3 R5.1 CIP-007-3 R5.1.1 CIP-007-3 R5.1.2

AC-6(1) CM-6(a)

PR.AC-4 PR.DS-5

FAU_GEN.1.2

SRG-OS-000324-GPOS-00125 SRG-OS-000480-GPOS-00227

SLES-15-040060

SV-234988r622137_rule

CCE-85625-2
Updated: about 1 year ago

- name: Disable Ctrl-Alt-Del Reboot Activation
  systemd:
    name: ctrl-alt-del.target
    force: true
    masked: true
    state: stopped  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - CCE-85625-2
  - DISA-STIG-SLES-15-040060
  - NIST-800-171-3.4.5
  - NIST-800-53-AC-6(1)
  - NIST-800-53-CM-6(a)
  - disable_ctrlaltdel_reboot
  - disable_strategy
  - high_severity
  - low_complexity
  - low_disruption
  - no_reboot_needed

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then

systemctl disable --now ctrl-alt-del.target
systemctl mask --now ctrl-alt-del.target
else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Disable Ctrl-Alt-Del Reboot Activation

Description

Rationale

Remediation - Ansible

Remediation - Shell Script