Disable RDS Support

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Description

The Reliable Datagram Sockets (RDS) protocol is a transport layer protocol designed to provide reliable high-bandwidth, low-latency communications between nodes in a cluster. To configure the system to prevent the rds kernel module from being loaded, add the following line to the file /etc/modprobe.d/rds.conf:

install rds /bin/false

This entry will cause a non-zero return value during a rds module installation and additionally convey the meaning of the entry to the user in form of an error message. If you would like to omit a non-zero return value and an error message, you may want to add a different line instead (both /bin/true and /bin/false are allowed by OVAL and will be accepted by the scan):

install rds /bin/true

Rationale

Disabling RDS protects the system against exploitation of any flaws in its implementation.

Remediation

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 kernel-core; then

if LC_ALL=C grep -q -m 1 "^install rds" /etc/modprobe.d/rds.conf ; then
	
	sed -i 's#^install rds.*#install rds /bin/false#g' /etc/modprobe.d/rds.conf
else
	echo -e "\n# Disable per security requirements" >> /etc/modprobe.d/rds.conf
	echo "install rds /bin/false" >> /etc/modprobe.d/rds.conf
fi

if ! LC_ALL=C grep -q -m 1 "^blacklist rds$" /etc/modprobe.d/rds.conf ; then
	echo "blacklist rds" >> /etc/modprobe.d/rds.conf
fi

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:
  - CCE-89280-2
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - kernel_module_rds_disabled
  - low_complexity
  - low_severity
  - medium_disruption
  - reboot_required

- name: Ensure kernel module 'rds' is disabled
  ansible.builtin.lineinfile:
    create: true
    dest: /etc/modprobe.d/rds.conf
    regexp: install\s+rds
    line: install rds /bin/false
  when: '"kernel-core" in ansible_facts.packages'
  tags:
  - CCE-89280-2
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - kernel_module_rds_disabled
  - low_complexity
  - low_severity
  - medium_disruption
  - reboot_required

- name: Ensure kernel module 'rds' is blacklisted
  ansible.builtin.lineinfile:
    create: true
    dest: /etc/modprobe.d/rds.conf
    regexp: ^blacklist rds$
    line: blacklist rds
  when: '"kernel-core" in ansible_facts.packages'
  tags:
  - CCE-89280-2
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - disable_strategy
  - kernel_module_rds_disabled
  - low_complexity
  - low_severity
  - medium_disruption
  - reboot_required