cis-ubuntu1604-v200-2-2-3

name	cis-ubuntu1604-v200-2-2-3
description	Ensure talk client is not installed
category	cis-networking
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","services"]
cis_id	2.2.3
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

2.2.3 Ensure talk client is not installed (Automated)

Description

The talk software makes it possible for users to send and receive messages across systems through a terminal session. The talk client, which allows initialization of talk sessions, is installed by default.

Rationale

The software presents a security risk as it uses unencrypted protocols for communication.

Impact

Many insecure service clients are used as troubleshooting tools and in testing environments. Uninstalling them can inhibit capability to test and troubleshoot. If they are required it is advisable to remove the clients after use to prevent accidental or intentional misuse.

Audit Procedure

Command Line

Verify talk is not installed. The following command may provide the needed information:

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

Expected Result

dpkg-query: package 'talk' is not installed and no information is available

Remediation

Command Line

Uninstall talk:

apt purge talk

Default Value

talk is not installed on minimal server installations.

References

1. CIS Controls v7 - 2.6 Address unapproved software

Profile

• Level 1 - Server
• Level 1 - Workstation