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V-204451

CAT II (Medium)

The Red Hat Enterprise Linux operating system must disable the file system automounter unless required.

Rule ID

SV-204451r958498_rule

STIG

Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Version

V3R15

CCIs

CCI-000366 CCI-000778 CCI-001958

Discussion

Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227

Check Content

Verify the operating system disables the ability to automount devices.

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

# 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

Configure the operating system to disable the ability to automount devices.

Turn off the automount service with the following commands:

# systemctl stop autofs
# systemctl disable autofs

If "autofs" is required for Network File System (NFS), it must be documented with the ISSO.