The echo daemon must be disabled on AIX.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215391 | AIX7-00-003086 | SV-215391r958478_rule | CCI-000381 | 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 | 2024-08-16 | |||
Details
Check Text (C-215391r958478_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-16587r294625_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