Finding ID | Version | Rule ID | IA Controls | Severity |
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V-230286 | RHEL-08-010480 | SV-230286r627750_rule | Medium |
Description |
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If a public host key file is modified by an unauthorized user, the SSH service may be compromised. |
STIG | Date |
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Red Hat Enterprise Linux 8 Security Technical Implementation Guide | 2023-09-11 |
Check Text ( C-32955r567604_chk ) |
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Verify the SSH public host key files have mode "0644" or less permissive with the following command: $ sudo ls -l /etc/ssh/*.pub -rw-r--r-- 1 root root 618 Nov 28 06:43 ssh_host_dsa_key.pub -rw-r--r-- 1 root root 347 Nov 28 06:43 ssh_host_key.pub -rw-r--r-- 1 root root 238 Nov 28 06:43 ssh_host_rsa_key.pub If any key.pub file has a mode more permissive than "0644", this is a finding. Note: SSH public key files may be found in other directories on the system depending on the installation. |
Fix Text (F-32930r567605_fix) |
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Change the mode of public host key files under "/etc/ssh" to "0644" with the following command: $ sudo chmod 0644 /etc/ssh/*key.pub The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command: $ sudo systemctl restart sshd.service |