The SUSE operating system SSH daemon private host key files must have mode 0600 or less permissive.

From SLES 12 Security Technical Implementation Guide

Associated with: CCI-000366

SV-92161r2_rule The SUSE operating system SSH daemon private host key files must have mode 0600 or less permissive.

Vulnerability discussion

If an unauthorized user obtains the private SSH host key file, the host could be impersonated.

Check content

Verify the SUSE operating system SSH daemon private host key files have mode "0600" or less permissive. The following command will find all SSH private key files on the system: # sudo find / -name '*ssh_host*key' -exec ls -lL {} \; Check the mode of the private host key files under "/etc/ssh" file with the following command: # ls -lL /etc/ssh/*key -rw------- 1 root wheel 668 Nov 28 06:43 ssh_host_dsa_key -rw------- 1 root wheel 582 Nov 28 06:43 ssh_host_key -rw------- 1 root wheel 887 Nov 28 06:43 ssh_host_rsa_key If any file has a mode more permissive than "0600", this is a finding.

Fix text

Configure the mode of the SUSE operating system SSH daemon private host key files under "/etc/ssh" to "0600" with the following command: # chmod 0600 /etc/ssh/ssh_host*key

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