Cis Ubuntu1604 V200 2 1 5

2.1.5 Ensure DHCP Server is not installed (Automated)

Description

The Dynamic Host Configuration Protocol (DHCP) is a service that allows machines to be dynamically assigned IP addresses.

Rationale

Unless a system is specifically set up to act as a DHCP server, it is recommended that this package be removed to reduce the potential attack surface.

Audit Procedure

Command Line

Run the following commands to verify isc-dhcp-server is not installed:

dpkg -s isc-dhcp-server | grep -E '(Status:|not installed)'

Expected Result

dpkg-query: package 'isc-dhcp-server' is not installed and no information is available

Remediation

Command Line

Run the following command to remove isc-dhcp-server:

apt purge isc-dhcp-server

Default Value

isc-dhcp-server is not installed on minimal server installations.

References

1. More detailed documentation on DHCP is available at http://www.isc.org/software/dhcp.
2. CIS Controls v7 - 9.2 Ensure Only Approved Ports, Protocols and Services Are Running

Profile

• Level 1 - Server
• Level 1 - Workstation