cyberstrikeus 6.4 Ensure DHCP Server is not enabled (Scored)
Profile Applicability
- Level 1
Description
The Dynamic Host Configuration Protocol (DHCP) is a service that allows machines to be dynamically assigned IP addresses.
Rationale
Unless a server is specifically set up to act as a DHCP server, it is recommended that this service be deleted to reduce the potential attack surface.
Audit Procedure
Using Command Line
Ensure no start conditions listed for isc-dhcp-server or isc-dhcp-server6:
initctl show-config isc-dhcp-server isc-dhcp-server
initctl show-config isc-dhcp-server6 isc-dhcp-server6
Expected Result
No start conditions should be listed for isc-dhcp-server or isc-dhcp-server6.
Remediation
Using Command Line
Remove or comment out start lines in /etc/init/isc-dhcp-server.conf and /etc/init/isc-dhcp-server6.conf:
sed -i 's/^start/#start/' /etc/init/isc-dhcp-server.conf
sed -i 's/^start/#start/' /etc/init/isc-dhcp-server6.conf
Default Value
Not enabled by default on Ubuntu 12.04 LTS Server.
References
- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0
- http://www.isc.org/software/dhcp
Profile
Level 1 - Scored