cis-ubuntu1204-v110-2-11

name	cis-ubuntu1204-v110-2-11
description	Add nodev Option to Removable Media Partitions
category	cis-os-hardening
version	1.1.0
author	cyberstrike-official
tags	["cis","ubuntu",12.04,"linux","filesystem","removable-media","nodev","mount-options"]
cis_id	2.11
cis_benchmark	CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

2.11 Add nodev Option to Removable Media Partitions (Not Scored)

Profile Applicability

• Level 1

Description

Set nodev on removable media to prevent character and block special devices that are present on the removable media from being treated as device files.

Rationale

Removable media containing character and block special devices could be used to circumvent security controls by allowing non-root users to access sensitive device files such as /dev/kmem or the raw disk partitions.

Audit Procedure

Using Command Line

grep <each removable media mountpoint> /etc/fstab

Verify that nodev is an option.

Expected Result

The nodev option should be present in the mount options for each removable media mountpoint.

Remediation

Using Command Line

Edit the /etc/fstab file and add nodev to the fourth field (mounting options). Look for entries that have mount points that contain words such as floppy or cdrom. See the fstab(5) manual page for more information.

Default Value

By default, the nodev option is not set on removable media partitions.

References

• CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

Profile

Level 1 - Not Scored