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The AIX SSH daemon must be configured for IP filtering.


Overview

Finding ID Version Rule ID IA Controls Severity
V-215295 AIX7-00-002112 SV-215295r508663_rule Medium
Description
The SSH daemon must be configured for IP filtering to provide a layered defense against connection attempts from unauthorized addresses.
STIG Date
IBM AIX 7.x Security Technical Implementation Guide 2023-05-17

Details

Check Text ( C-16493r294336_chk )
Check the TCP wrappers configuration files to determine if SSHD is configured to use TCP wrappers using commands:

# grep sshd /etc/hosts.deny
sshd : ALL

# grep sshd /etc/hosts.allow
sshd : 10.10.20.*

If no entries are returned, the TCP wrappers are not configured for SSHD, this is a finding.
Fix Text (F-16491r294337_fix)
Add appropriate IP restrictions for SSH to the "/etc/hosts.deny" and/or "/etc/hosts.allow" files.

TCP Wrappers can be installed from the AIX Expansion Pack by installing fileset "netsec.options.tcpwrappers" using the following command (assume AIX Expansion Pack is mounted on /dev/cd0):
# installp -aXYgd /dev/cd0 -e /tmp/install.log netsec.options.tcpwrappers