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cis-ubuntu1204-v110-6-4

DevOps & Security
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Ensure DHCP Server is not enabled

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_12.04_LTS_Server_Benchmark_v1.1.0/cis-ubuntu1204-v110-6-4/SKILL.md

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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

Profile

Level 1 - Scored