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V-215391

CAT II (Medium)

The echo daemon must be disabled on AIX.

Rule ID

SV-215391r958478_rule

STIG

IBM AIX 7.x Security Technical Implementation Guide

Version

V3R2

CCIs

CCI-000381

Discussion

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.

Check Content

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

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