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RHEL 9 must not allow a noncertificate trusted host SSH logon to the system.


Overview

Finding ID Version Rule ID IA Controls Severity
V-257992 RHEL-09-255080 SV-257992r952190_rule Medium
Description
SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts.
STIG Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide 2024-02-19

Details

Check Text ( C-61733r952189_chk )
Verify the operating system does not allow a noncertificate trusted host SSH logon to the system with the following command:

$ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*hostbasedauthentication'

HostbasedAuthentication no

If the "HostbasedAuthentication" keyword is not set to "no", is missing, or is commented out, this is a finding.

If the required value is not set, this is a finding.
Fix Text (F-61657r925962_fix)
To configure RHEL 9 to not allow a noncertificate trusted host SSH logon to the system add or modify the following line in "/etc/ssh/sshd_config".

HostbasedAuthentication no

Restart the SSH daemon for the settings to take effect:

$ sudo systemctl restart sshd.service