Title

The AIX DHCP client must not send dynamic DNS updates. (Cat II impact)

Discussion

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

Check Content

If AIX does not use DHCP client, this is Not Applicable. 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 or comment-out "updateDNS" lines from the "/etc/dhcpcd.ini" and "/etc/dhcpc.opt" files.

Additional Identifiers

Rule ID: SV-215427r991589_rule

Vulnerability ID: V-215427

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.