Cis Ubuntu1804 V220 2 3 2

---
name: cis-ubuntu1804-v220-2-3-2
description: "Ensure rsh client is not installed"
category: cis-networking
version: "2.2.0"
author: cyberstrike-official
tags: [cis, ubuntu, linux, ubuntu-18.04, services, rsh-client]
cis_id: "2.3.2"
cis_benchmark: "CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0"
tech_stack: [ubuntu, linux]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---

# 2.3.2 Ensure rsh client is not installed (Automated)

## Profile

- Level 1 - Server
- Level 1 - Workstation

## Description

The `rsh-client` package contains the client commands for the rsh services.

## Rationale

These legacy clients contain numerous security exposures and have been replaced with the more secure SSH package. Even if the server is removed, it is best to ensure the clients are also removed to prevent users from inadvertently attempting to use these commands and therefore exposing their credentials. Note that removing the `rsh-client` package removes the clients for `rsh`, `rcp` and `rlogin`.

## 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 `rsh-client` is not installed. Use the following command to provide the needed information:

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

Nothing should be returned.

## Expected Result

No output (empty result).

## Remediation

### Command Line

Uninstall `rsh`:

```bash
# apt purge rsh-client
```

## 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