SLEM 5 SSH daemon must be configured to not allow authentication using known hosts authentication.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-261340 | SRG-OS-000480-GPOS-00227 | SLEM-05-255075 | SV-261340r996483_rule | 2024-06-04 | 1 |
| Description |
|---|
| Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere. |
| ℹ️ Check |
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| Verify SLEM 5 SSH daemon is configured to not allow authentication using "known hosts" authentication 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*ignoreuserknownhosts' /etc/ssh/sshd_config:IgnoreUserKnownHosts yes If "IgnoreUserKnownHosts" is not set to "no", is commented out, missing, or conflicting results are returned, this is a finding. |
| ✔️ Fix |
|---|
| Configure SLEM 5 SSH daemon to not allow authentication using "known hosts" authentication. Add or modify the following line in the "/etc/ssh/sshd_config" file: IgnoreUserKnownHosts yes Restart the SSH daemon in order for the changes to take effect: > sudo systemctl restart sshd.service |