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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 |