UCF STIG Viewer Logo

The OL 8 SSH daemon must perform strict mode checking of home directory configuration files.


Overview

Finding ID Version Rule ID IA Controls Severity
V-248603 OL08-00-010500 SV-248603r858568_rule Medium
Description
If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as another user.
STIG Date
Oracle Linux 8 Security Technical Implementation Guide 2022-12-06

Details

Check Text ( C-52037r858567_chk )
Verify the SSH daemon performs strict mode checking of home directory configuration files with the following command:

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

StrictModes yes

If "StrictModes" is set to "no" or is missing, or if the returned line is commented out, this is a finding.
If conflicting results are returned, this is a finding.
Fix Text (F-51991r779374_fix)
Configure SSH to perform strict mode checking of home directory configuration files.

Uncomment the "StrictModes" keyword in "/etc/ssh/sshd_config" and set the value to "yes":

StrictModes yes

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