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OL 8 must not allow users to override SSH environment variables.


Overview

Finding ID Version Rule ID IA Controls Severity
V-248650 OL08-00-010830 SV-248650r877377_rule High
Description
SSH environment options potentially allow users to bypass access restriction in some configurations.
STIG Date
Oracle Linux 8 Security Technical Implementation Guide 2022-12-06

Details

Check Text ( C-52084r858579_chk )
Verify that unattended or automatic login via SSH is disabled with the following command:

$ sudo grep -ir PermitUserEnvironment /etc/ssh/sshd_config*

PermitUserEnvironment no

If "PermitUserEnvironment" is set to "yes", is missing completely, or is commented out, this is a finding.
If conflicting results are returned, this is a finding.
Fix Text (F-52038r779515_fix)
Configure OL 8 to allow the SSH daemon to not allow unattended or automatic login to the system.

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

PermitUserEnvironment no

The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command:

$ sudo systemctl restart sshd.service