Title

SLEM 5 SSH daemon private host key files must have mode 640 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 SLEM 5 SSH daemon private host key files have mode "640" or less permissive. The following command will find all SSH private key files on the system with the following command: > 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 "640", this is a finding.

Fix Text

Configure the mode of SLEM 5 SSH daemon private host key files under "/etc/ssh" to "640" with the following command: > sudo chmod 640 /etc/ssh/ssh_host*key

Additional Identifiers

Rule ID: SV-261294r996359_rule

Vulnerability ID: V-261294

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

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