The DHCP client must be disabled if not needed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-50889	OL6-00-000292	SV-65095r1_rule		Medium

Description
DHCP relies on trusting the local network. If the local network is not trusted, then it should not be used. However, the automatic configuration provided by DHCP is commonly used and the alternative, manual configuration, presents an unacceptable burden in many circumstances.

STIG	Date
Oracle Linux 6 Security Technical Implementation Guide	2017-03-01

Details

Check Text ( C-53361r1_chk )
To verify that DHCP is not being used, examine the following file for each interface. # /etc/sysconfig/network-scripts/ifcfg-[IFACE] If there is any network interface without a associated "ifcfg" file, this is a finding. Look for the following: BOOTPROTO=none Also verify the following, substituting the appropriate values based on your site's addressing scheme: NETMASK=[local LAN netmask] IPADDR=[assigned IP address] GATEWAY=[local LAN default gateway] If it does not, this is a finding.

Check Text ( C-53361r1_chk )

To verify that DHCP is not being used, examine the following file for each interface.

# /etc/sysconfig/network-scripts/ifcfg-[IFACE]

If there is any network interface without a associated "ifcfg" file, this is a finding.

Look for the following:

BOOTPROTO=none

Also verify the following, substituting the appropriate values based on your site's addressing scheme:

NETMASK=[local LAN netmask]
IPADDR=[assigned IP address]
GATEWAY=[local LAN default gateway]

If it does not, this is a finding.

Fix Text (F-55683r1_fix)
For each interface [IFACE] on the system (e.g. eth0), edit "/etc/sysconfig/network-scripts/ifcfg-[IFACE]" and make the following changes. Correct the BOOTPROTO line to read: BOOTPROTO=none Add or correct the following lines, substituting the appropriate values based on your site's addressing scheme: NETMASK=[local LAN netmask] IPADDR=[assigned IP address] GATEWAY=[local LAN default gateway]