documentation_complete: true


title: 'Disable Ctrl-Alt-Del Reboot Activation'

description: |-
    By default, <tt>SystemD</tt> will reboot the system if the <tt>Ctrl-Alt-Del</tt>
    key sequence is pressed.
    <br /><br />
    To configure the system to ignore the <tt>Ctrl-Alt-Del</tt> key sequence from the
    {{% if product != "rhcos4" %}}
    command line instead of rebooting the system, do either of the following:
    <pre>ln -sf /dev/null /etc/systemd/system/ctrl-alt-del.target</pre>
    or
    <pre>systemctl mask ctrl-alt-del.target</pre>
    <br /><br />
    Do not simply delete the <tt>/usr/lib/systemd/system/ctrl-alt-del.service</tt> file,
    as this file may be restored during future system updates.
    {{% else %}}
    command line instead of rebooting the system, create a <tt>MachineConfig</tt>
    similar to the following:
    <pre>
    apiVersion: machineconfiguration.openshift.io/v1
    kind: MachineConfig
    metadata:
      labels:
        machineconfiguration.openshift.io/role: master
      name: 75-master-disable-ctrlaltdel-reboot
    spec:
      config:
        ignition:
          version: 3.1.0
        systemd:
          units:
          - name: ctrl-alt-del.target
            mask: true
    EOF
    </pre>
    <p>
    This will mask the <tt>ctrl-alt-del.target</tt> systemd target for all the
    nodes labeled with the "master" role.
    </p>
    {{{ machineconfig_description_footer() | indent(4) }}}
    {{% endif %}}

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.

severity: high

identifiers:
    cce@rhcos4: CCE-82493-8
    cce@rhel8: CCE-80785-9
    cce@rhel9: CCE-86667-3
    cce@rhel10: CCE-90035-7
    cce@sle12: CCE-83018-2
    cce@sle15: CCE-85625-2
    cce@sle16: CCE-96667-1
    cce@slmicro5: CCE-93744-1
    cce@slmicro6: CCE-95054-3 

references:
    cis-csc: 12,13,14,15,16,18,3,5
    cobit5: APO01.06,DSS05.04,DSS05.07,DSS06.02
    cui: 3.4.5
    hipaa: 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)
    isa-62443-2009: 4.3.3.7.3
    isa-62443-2013: 'SR 2.1,SR 5.2'
    iso27001-2013: 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
    nerc-cip: 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
    nist: CM-6(a),AC-6(1)
    nist-csf: PR.AC-4,PR.DS-5
    ospp: FAU_GEN.1.2
    srg: SRG-OS-000324-GPOS-00125,SRG-OS-000480-GPOS-00227
    stigid@ol7: OL07-00-020230
    stigid@ol8: OL08-00-040170
    stigid@sle12: SLES-12-010610
    stigid@sle15: SLES-15-040060

{{% if pkg_system == "dpkg" %}}
platform: not container
{{% endif %}}

ocil_clause: 'the system is configured to reboot when Ctrl-Alt-Del is pressed'

ocil: |-
    To ensure the system is configured to mask the Ctrl-Alt-Del sequence, Check
    that the ctrl-alt-del.target is masked and not active with the following
    command:
    <pre>sudo systemctl status ctrl-alt-del.target</pre>
    The output should indicate that the target is masked and not active. It
    might resemble following output:
    <pre>ctrl-alt-del.target
    Loaded: masked (/dev/null; bad)
    Active: inactive (dead)</pre>

fixtext: |-
    Configure the system to disable the ctrl-alt-del.target with the following command:

    $ sudo systemctl disable --now ctrl-alt-del.target
    $ sudo systemctl mask --now ctrl-alt-del.target

srg_requirement: 'The x86 Ctrl-Alt-Delete key sequence must be disabled on {{{ full_name }}}.'
