TMA-AIX-4.6.3.8

Ensure sshd IgnoreRhosts is enabled

HighLevel 1Automatedaix

Description

The IgnoreRhosts parameter specifies that .rhosts and .shosts files will not be used in RhostsRSAAuthentication or HostbasedAuthentication. Setting this parameter forces users to enter a password or provide an SSH key when authenticating with SSH, rather than trusting the remote host. Audit: evaluates the effective configuration from `sshd -T` (Match blocks must be reviewed separately).

How it is checked

Audit method: Shell command

shell

command -v sshd >/dev/null 2>&1 || exit 1; out=$(sshd -T 2>/dev/null) || exit 1; r=compliant; for p in '^ignorerhosts[[:blank:]]+yes$'; do printf '%s\n' "$out" | grep -Eiq -- "$p" || r="not matched: $p"; done; echo "$r"

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Edit the /etc/ssh/sshd_config file to set the parameter above any Match set entries as follows: IgnoreRhosts yes Re-cycle the sshd daemon to pick up the configuration changes: stopsrc -s sshd startsrc -s sshd Note: First occurrence of a option takes precedence, Match set statements withstanding.

Properties

Operating systems: Any
Tags: aixssh
Reference: CIS IBM AIX 7 Benchmark v1.2.0 - 4.6.3.8 Ensure sshd IgnoreRhosts is enabled

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target aix