cis-ubuntu1604-v200-1-1-20

name	cis-ubuntu1604-v200-1-1-20
description	Ensure nosuid option set on removable media partitions
category	cis-storage
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","filesystem","removable-media","nosuid","mount-option"]
cis_id	1.1.20
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

Ensure nosuid option set on removable media partitions

Description

The nosuid mount option specifies that the filesystem cannot contain setuid files.

Rationale

Setting this option on a file system prevents users from introducing privileged programs onto the system and allowing non-root users to execute them.

Impact

None noted.

Audit Procedure

Command Line

# Run the following command and verify that the nosuid option is set on all removable media partitions.
mount

Expected Result

Verify that the nosuid option is set on all removable media partitions.

Remediation

Command Line

# Edit the /etc/fstab file and add nosuid to the fourth field (mounting options) of all removable media partitions.
# 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

Not set 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: Manual