Title

The SUSE operating system SSH daemon private host key files must have mode 0640 or less permissive. (Cat II impact)

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 "0640" 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: > find /etc/ssh -name 'ssh_host*key' -exec stat -c "%a %n" {} \; 640 /etc/ssh/ssh_host_rsa_key 640 /etc/ssh/ssh_host_dsa_key 640 /etc/ssh/ssh_host_ecdsa_key 640 /etc/ssh/ssh_host_ed25519_key If any file has a mode more permissive than "0640", this is a finding.

Fix Text

Configure the mode of the SUSE operating system SSH daemon private host key files under "/etc/ssh" to "0640" with the following command: > sudo chmod 0640 /etc/ssh/ssh_host*key

Additional Identifiers

Rule ID: SV-235009r880958_rule

Vulnerability ID: V-235009

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

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