Uninstall tftp-server Package

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Description

The tftp-server package can be removed with the following command:

 $ sudo yum erase tftp-server

Rationale

Removing the tftp-server package decreases the risk of the accidental (or intentional) activation of tftp services.

If TFTP is required for operational support (such as transmission of router configurations), its use must be documented with the Information Systems Securty Manager (ISSM), restricted to only authorized personnel, and have access control rules established.

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

# CAUTION: This remediation script will remove tftp-server
#	   from the system, and may remove any packages
#	   that depend on tftp-server. Execute this
#	   remediation AFTER testing on a non-production
#	   system!

if rpm -q --quiet "tftp-server" ; then

    yum remove -y "tftp-server"

fi

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Ensure tftp-server is removed
  package:
    name: tftp-server
    state: absent
  tags:
  - CCE-80213-2
  - DISA-STIG-RHEL-07-040700
  - NIST-800-53-CM-6(a)
  - NIST-800-53-CM-7(a)
  - NIST-800-53-CM-7(b)
  - PCI-DSSv4-2.2.4
  - disable_strategy
  - high_severity
  - low_complexity
  - low_disruption
  - no_reboot_needed
  - package_tftp-server_removed