OL 9 must not allow a noncertificate trusted host SSH logon to the system.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-271719 | SRG-OS-000480-GPOS-00229 | OL09-00-002357 | SV-271719r1091869_rule | 2026-02-17 | 1 |
Description
SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts.
ℹ️ Check
Verify that OL 9 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.
✔️ Fix
Configure OL 9 to not allow a noncertificate trusted host SSH logon to access the system.
Add or modify the following line in "/etc/ssh/sshd_config" or in a file in "/etc/ssh/sshd_config.d".
HostbasedAuthentication no
Restart the SSH daemon for the settings to take effect:
$ sudo systemctl restart sshd.service