The DHCP client must not send dynamic DNS updates.

From Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-26933r2_rule The DHCP client must not send dynamic DNS updates.

Vulnerability discussion

Dynamic DNS updates transmit unencrypted information about a system including its name and address and should not be used unless needed.

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Fix text

Edit or add the "/etc/dhclient.conf" file and add or edit the "do-forward-updates" setting to false. Procedure: # echo "do-forward-updates false;" >> /etc/dhclient.conf

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