The TOSS file system automounter must be disabled unless required.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-252916	TOSS-04-010050	SV-252916r958498_rule		Medium

Description
Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity.

STIG	Date
Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide	2024-05-30

Details

Check Text ( C-56369r824070_chk )
Verify the operating system disables the ability to automount devices. Check to see if automounter service is active with the following command: Note: If the autofs service is not installed, this requirement is Not Applicable. $ sudo systemctl status autofs autofs.service - Automounts filesystems on demand Loaded: loaded (/usr/lib/systemd/system/autofs.service; disabled) Active: inactive (dead) If the "autofs" status is set to "active" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Check Text ( C-56369r824070_chk )

Verify the operating system disables the ability to automount devices.

Check to see if automounter service is active with the following command:

Note: If the autofs service is not installed, this requirement is Not Applicable.

$ sudo systemctl status autofs

autofs.service - Automounts filesystems on demand
Loaded: loaded (/usr/lib/systemd/system/autofs.service; disabled)
Active: inactive (dead)

If the "autofs" status is set to "active" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix Text (F-56319r824071_fix)
Configure the operating system to disable the ability to automount devices. Turn off the automount service with the following commands: $ sudo systemctl stop autofs $ sudo systemctl disable autofs If "autofs" is required for Network File System (NFS), it must be documented with the ISSO.