The DHCP client must not send dynamic DNS updates.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-38963r1_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.

Check content

Determine if the system's DHCP client is configured to send dynamic DNS updates. #grep "^updateDNS" /etc/dhcpc.opt /etc/dhcpcd.ini If any lines are returned, this is a finding.

Fix text

Configure the system's DHCP client to not send dynamic DNS updates. Remove / comment updateDNS lines from the /etc/dhcpcd.ini and /etc/dhcpc.opt files.

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