cis-ubuntu-14-04-lts-2-3-2-ensure-rsh-client-is-not-installed

name	CIS Ubuntu 14.04 LTS - 2.3.2 Ensure rsh client is not installed
description	Verify that the rsh client package is not installed
category	cis-os-hardening
version	2.1.0
author	cyberstrike-official
tags	["cis","ubuntu","ubuntu-14.04","level-1","scored","service-clients"]
cis_id	2.3.2
cis_benchmark	CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	high

2.3.2 Ensure rsh client is not installed (Scored)

Profile Applicability

• Level 1 - Server
• Level 1 - Workstation

Description

The rsh 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 package removes the clients for rsh, rcp and rlogin.

Audit Procedure

Run the following commands and verify rsh is not installed:

dpkg -s rsh-client
dpkg -s rsh-redone-client

Expected Result

Both commands should indicate that the packages are not installed.

Remediation

Run the following command to uninstall rsh:

apt-get remove rsh-client rsh-redone-client

Default Value

rsh client is not installed by default.

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.

References

• CIS Controls: 3.4 Use Only Secure Channels For Remote System Administration

Profile

• Level 1 - Server
• Level 1 - Workstation