The echo daemon must be disabled on AIX.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-91413	AIX7-00-003086	SV-101511r1_rule		Medium

Description
The echo service can be used in Denial of Service or SMURF attacks. It can also be used by someone else to get through a firewall or start a data storm. The echo service is unnecessary and it increases the attack vector of the system.

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2020-02-24

Details

Check Text ( C-90567r1_chk )
Check the /etc/inetd.conf for TCP and UDP echo service entries using command: # grep echo /etc/inetd.conf | grep -v \# If there is any output from the command, this is a finding.

Fix Text (F-97611r1_fix)
In "/etc/inetd.conf", comment out the "echo" entries by running commands: # chsubserver -r inetd -C /etc/inetd.conf -d -v 'echo' -p 'tcp' # chsubserver -r inetd -C /etc/inetd.conf -d -v 'echo' -p 'udp' Restart inetd: # refresh -s inetd