Disable KDump Kernel Crash Analyzer (kdump)

An XCCDF Rule

Description

The kdump-tools service provides a kernel crash dump analyzer. It uses the kexec system call to boot a secondary kernel ("capture" kernel) following a system crash, which can load information from the crashed kernel for analysis. The kdump-tools service can be disabled with the following command:

$ sudo systemctl mask --now kdump-tools.service

Rationale

Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps consume a considerable amount of disk space and may result in denial of service by exhausting the available space on the target file system partition. Unless the system is used for kernel development or testing, there is little need to run the kdump service.

ID: xccdf_org.ssgproject.content_rule_service_kdump_disabled
Severity: Medium
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-000366

164.308(a)(1)(ii)(D) 164.308(a)(3) 164.308(a)(4) 164.310(b) 164.310(c) 164.312(a) 164.312(e)

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

FMT_SMF_EXT.1.1

SRG-OS-000269-GPOS-00103 SRG-OS-000480-GPOS-00227

UBTU-20-010413

SV-238334r654177_rule
Updated: 5 days ago

include disable_kdump-tools

class disable_kdump-tools {
  service {'kdump-tools':
    enable => false,
    ensure => 'stopped',  }
}

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - DISA-STIG-UBTU-20-010413
  - NIST-800-53-CM-6(a)  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_kdump_disabled

- name: Disable KDump Kernel Crash Analyzer (kdump) - Collect systemd Services Present
    in the System
  ansible.builtin.command: systemctl -q list-unit-files --type service
  register: service_exists
  changed_when: false
  failed_when: service_exists.rc not in [0, 1]
  check_mode: false
  when: '"kernel" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010413
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_kdump_disabled

- name: Disable KDump Kernel Crash Analyzer (kdump) - Ensure kdump-tools.service is
    Masked
  ansible.builtin.systemd:
    name: kdump-tools.service
    state: stopped
    enabled: false
    masked: true
  when:
  - '"kernel" in ansible_facts.packages'
  - service_exists.stdout_lines is search("kdump-tools.service", multiline=True)
  tags:
  - DISA-STIG-UBTU-20-010413
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_kdump_disabled

- name: Unit Socket Exists - kdump-tools.socket
  ansible.builtin.command: systemctl -q list-unit-files kdump-tools.socket
  register: socket_file_exists
  changed_when: false
  failed_when: socket_file_exists.rc not in [0, 1]
  check_mode: false
  when: '"kernel" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010413
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_kdump_disabled

- name: Disable KDump Kernel Crash Analyzer (kdump) - Disable Socket kdump-tools
  ansible.builtin.systemd:
    name: kdump-tools.socket
    enabled: false
    state: stopped
    masked: true
  when:
  - '"kernel" in ansible_facts.packages'
  - socket_file_exists.stdout_lines is search("kdump-tools.socket", multiline=True)
  tags:
  - DISA-STIG-UBTU-20-010413
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - service_kdump_disabled

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


[customizations.services]
masked = ["kdump-tools"]

# Remediation is applicable only in certain platforms
if dpkg-query --show --showformat='${db:Status-Status}
' 'kernel' 2>/dev/null | grep -q installed; then

SYSTEMCTL_EXEC='/usr/bin/systemctl'
"$SYSTEMCTL_EXEC" stop 'kdump-tools.service'"$SYSTEMCTL_EXEC" disable 'kdump-tools.service'
"$SYSTEMCTL_EXEC" mask 'kdump-tools.service'
# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files kdump-tools.socket; then
    "$SYSTEMCTL_EXEC" stop 'kdump-tools.socket'
    "$SYSTEMCTL_EXEC" mask 'kdump-tools.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 'kdump-tools.service' || true

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

Disable KDump Kernel Crash Analyzer (kdump)

Description

Rationale

Remediation - Puppet

Remediation - Ansible

Remediation - Kubernetes Patch

Remediation - OS Build Blueprint

Remediation - Shell Script