Disable the mmap_low_allowed SELinux Boolean

An XCCDF Rule

Description

By default, the SELinux boolean mmap_low_allowed is disabled. If this setting is enabled, it should be disabled. To disable the mmap_low_allowed SELinux boolean, run the following command:

$ sudo setsebool -P mmap_low_allowed off

ID: xccdf_org.ssgproject.content_rule_sebool_mmap_low_allowed
Severity: Medium
Updated: about 1 year ago

- name: Disable the mmap_low_allowed SELinux Boolean - Ensure libsemanage-python Installed
  package:
    name: libsemanage-python
    state: present
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - sebool_mmap_low_allowed
- name: XCCDF Value var_mmap_low_allowed # promote to variable
  set_fact:
    var_mmap_low_allowed: !!str <xccdf-1.2:sub xmlns:xccdf-1.2="http://checklists.nist.gov/xccdf/1.2" idref="xccdf_org.ssgproject.content_value_var_mmap_low_allowed" use="legacy"/>
  tags:
    - always

- name: Disable the mmap_low_allowed SELinux Boolean - Set SELinux Boolean mmap_low_allowed
    Accordingly
  seboolean:
    name: mmap_low_allowed
    state: '{{ var_mmap_low_allowed }}'
    persistent: true
  when:
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  - ansible_facts.selinux.status == 'enabled'
  tags:
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - sebool_mmap_low_allowed

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

if ! rpm -q --quiet "libsemanage-python" ; then
    yum install -y "libsemanage-python"
fi

if selinuxenabled; then

    var_mmap_low_allowed='<xccdf-1.2:sub xmlns:xccdf-1.2="http://checklists.nist.gov/xccdf/1.2" idref="xccdf_org.ssgproject.content_value_var_mmap_low_allowed" use="legacy"/>'

    setsebool -P mmap_low_allowed $var_mmap_low_allowed

else
    echo "Skipping remediation, SELinux is disabled";
    false
fi

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

Disable the mmap_low_allowed SELinux Boolean

Description

Remediation - Ansible

Remediation - Shell Script