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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-217276	SLES-12-030220	SV-217276r603262_rule		Medium

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

STIG	Date
SLES 12 Security Technical Implementation Guide	2020-12-04

Details

Check Text ( C-18504r369984_chk )
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_hostkey' -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.

Check Text ( C-18504r369984_chk )

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 (F-18502r369985_fix)
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