Cis Ubuntu1804 V220 2 3 3

---
name: cis-ubuntu1804-v220-2-3-3
description: "Ensure talk client is not installed"
category: cis-networking
version: "2.2.0"
author: cyberstrike-official
tags: [cis, ubuntu, linux, ubuntu-18.04, services, talk-client]
cis_id: "2.3.3"
cis_benchmark: "CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0"
tech_stack: [ubuntu, linux]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---

# 2.3.3 Ensure talk client is not installed (Automated)

## Profile

- Level 1 - Server
- Level 1 - Workstation

## 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:

```bash
# dpkg-query -s talk &>/dev/null && echo "talk is installed"
```

Nothing should be returned.

## Expected Result

No output (empty result).

## Remediation

### Command Line

Uninstall `talk`:

```bash
# apt purge talk
```

## References

1. NIST SP 800-53 Rev. 5: CM-7

## CIS Controls

- v8: 4.8 - Uninstall or Disable Unnecessary Services on Enterprise Assets and Software
- v7: 9.2 - Ensure Only Approved Ports, Protocols and Services Are Running