cis-ubuntu1604-v200-1-1-1-2

name	cis-ubuntu1604-v200-1-1-1-2
description	Ensure mounting of freevxfs filesystems is disabled
category	cis-storage
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","filesystem","freevxfs","kernel-module"]
cis_id	1.1.1.2
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

Ensure mounting of freevxfs filesystems is disabled

Description

The freevxfs filesystem type is a free version of the Veritas type filesystem. This is the primary filesystem type for HP-UX operating systems.

Rationale

Removing support for unneeded filesystem types reduces the local attack surface of the system. If this filesystem type is not needed, disable it.

Impact

None noted.

Audit Procedure

Command Line

# modprobe -n -v freevxfs | grep -E '(freevxfs|install)'
# lsmod | grep freevxfs

Expected Result

install /bin/true

The lsmod command should return no output.

Remediation

Command Line

# Edit or create a file in the /etc/modprobe.d/ directory ending in .conf
# Example: vi /etc/modprobe.d/freevxfs.conf
# and add the following line:
install freevxfs /bin/true

# Run the following command to unload the freevxfs module:
rmmod freevxfs

Default Value

Not disabled by default.

References

• CIS Controls Version 7 - 5.1 Establish Secure Configurations: Maintain documented, standard security configuration standards for all authorized operating systems and software.

Profile

Level 1 - Server / Level 1 - Workstation, Assessment: Automated