cis-ubuntu1604-v200-1-8-1

name	cis-ubuntu1604-v200-1-8-1
description	Ensure GNOME Display Manager is removed
category	cis-storage
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","gdm","gnome","display-manager","attack-surface"]
cis_id	1.8.1
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - 1.8.1

Profile Applicability

• Level 2 - Server

Description

The GNOME Display Manager (GDM) is a program that manages graphical display servers and handles graphical user logins.

Rationale

If a Graphical User Interface (GUI) is not required, it should be removed to reduce the attack surface of the system.

Impact

Removing the GNOME Display manager will remove the Graphical User Interface (GUI) from the system.

Audit Procedure

Command Line

Run the following command and verify gdm3 is not installed:

dpkg -s gdm3 | grep -E '(Status:|not installed)'

Expected output: dpkg-query: package 'gdm3' is not installed and no information is available

Expected Result

The gdm3 package should not be installed on server systems.

Remediation

Command Line

Run the following command to uninstall gdm3:

apt purge gdm3

Default Value

Not applicable.

References

None.

CIS Controls

Controls Version	Control
v7	2.6 Address unapproved software

Assessment Status

Manual