cis-ubuntu1804-v220-1-1-5-2

name	cis-ubuntu1804-v220-1-1-5-2
description	Ensure nodev option set on /var/log partition
category	cis-storage
version	2.2.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-18.04","partition","var-log","mount-option","nodev"]
cis_id	1.1.5.2
cis_benchmark	CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

Ensure nodev option set on /var/log partition

Profile

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

Description

The nodev mount option specifies that the filesystem cannot contain special devices.

Rationale

Since the /var/log filesystem is not intended to support devices, set this option to ensure that users cannot create block or character special devices in /var/log.

Impact

None noted.

Audit Procedure

Command Line

Verify that the nodev option is set for the /var/log mount.

# findmnt -kn /var/log | grep nodev

Expected Result

/var/log     /dev/sda4  ext4   rw,nosuid,nodev,noexec,relatime,seclabel

Remediation

Command Line

Edit the /etc/fstab file and add nodev to the fourth field (mounting options) for the /var/log partition.

# Example:
# <device> /var/log   <fstype>   defaults,rw,nosuid,nodev,noexec,relatime   0 0

# Run the following command to remount /var/log with the configured options:
mount -o remount /var/log

Default Value

Not set by default.

References

1. See the fstab(5) manual page for more information.
2. NIST SP 800-53 Rev. 5: AC-3, MP-2

CIS Controls

v8 - 3.3 Configure Data Access Control Lists (IG 1, IG 2, IG 3) v7 - 14.6 Protect Information through Access Control Lists (IG 1, IG 2, IG 3)

MITRE ATT&CK Mappings: T1200, T1200.000 (TA0005) - M1022