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Description
The snmpd service can be disabled with the following command:
$ sudo systemctl mask --now snmpd.service
Rationale
Running SNMP software provides a network-based avenue of attack, and
should be disabled if not needed.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
# Remediation is applicable only in certain platforms
if ( rpm --quiet -q net-snmp && rpm --quiet -q kernel ); then
SYSTEMCTL_EXEC='/usr/bin/systemctl'
if [[ $("$SYSTEMCTL_EXEC" is-system-running) != "offline" ]]; then
"$SYSTEMCTL_EXEC" stop 'snmpd.service'
fi
"$SYSTEMCTL_EXEC" disable 'snmpd.service'
"$SYSTEMCTL_EXEC" mask 'snmpd.service'
# Disable socket activation if we have a unit file for it
if "$SYSTEMCTL_EXEC" -q list-unit-files snmpd.socket; then
if [[ $("$SYSTEMCTL_EXEC" is-system-running) != "offline" ]]; then
"$SYSTEMCTL_EXEC" stop 'snmpd.socket'
fi
"$SYSTEMCTL_EXEC" mask 'snmpd.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 'snmpd.service' || true
else
>&2 echo 'Remediation is not applicable, nothing was done'
fi
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Gather the package facts
package_facts:
manager: auto
tags:
- disable_strategy
- low_complexity
- low_disruption
- low_severity
- no_reboot_needed
- service_snmpd_disabled
- name: Disable snmpd Service - 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: ( "net-snmp" in ansible_facts.packages and "kernel" in ansible_facts.packages
)
tags:
- disable_strategy
- low_complexity
- low_disruption
- low_severity
- no_reboot_needed
- service_snmpd_disabled
- name: Disable snmpd Service - Ensure snmpd.service is Masked
ansible.builtin.systemd:
name: snmpd.service
state: stopped
enabled: false
masked: true
when:
- ( "net-snmp" in ansible_facts.packages and "kernel" in ansible_facts.packages
)
- service_exists.stdout_lines is search("snmpd.service", multiline=True)
tags:
- disable_strategy
- low_complexity
- low_disruption
- low_severity
- no_reboot_needed
- service_snmpd_disabled
- name: Unit Socket Exists - snmpd.socket
ansible.builtin.command: systemctl -q list-unit-files snmpd.socket
register: socket_file_exists
changed_when: false
failed_when: socket_file_exists.rc not in [0, 1]
check_mode: false
when: ( "net-snmp" in ansible_facts.packages and "kernel" in ansible_facts.packages
)
tags:
- disable_strategy
- low_complexity
- low_disruption
- low_severity
- no_reboot_needed
- service_snmpd_disabled
- name: Disable snmpd Service - Disable Socket snmpd
ansible.builtin.systemd:
name: snmpd.socket
enabled: false
state: stopped
masked: true
when:
- ( "net-snmp" in ansible_facts.packages and "kernel" in ansible_facts.packages
)
- socket_file_exists.stdout_lines is search("snmpd.socket", multiline=True)
tags:
- disable_strategy
- low_complexity
- low_disruption
- low_severity
- no_reboot_needed
- service_snmpd_disabled
