OL09-00-002358 - OL 9 must not allow users to override SSH environment variables.

Information

SSH environment options potentially allow users to bypass access restriction in some configurations.

Solution

Configure the OL 9 SSH daemon to not allow unattended or automatic logon to the system.

Add or edit the following line in the "/etc/ssh/sshd_config" or in a file in "/etc/ssh/sshd_config.d":

PermitUserEnvironment no

Restart the SSH daemon for the setting to take effect:

$ sudo systemctl restart sshd.service

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Oracle_Linux_9_V1R6_STIG.zip