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V-215295

CAT II (Medium)

The AIX SSH daemon must be configured for IP filtering.

Rule ID

SV-215295r1009551_rule

STIG

IBM AIX 7.x Security Technical Implementation Guide

Version

V3R2

CCIs

CCI-000366

Discussion

The SSH daemon must be configured for IP filtering to provide a layered defense against connection attempts from unauthorized addresses.

Check Content

Note: If the installed version of OpenSSH is 6.7 or above, this requirement is not applicable.

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

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