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


Overview

Finding ID Version Rule ID IA Controls Severity
V-75847 UBTU-16-030330 SV-90527r2_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
Canonical Ubuntu 16.04 Security Technical Implementation Guide 2020-05-29

Details

Check Text ( C-75535r2_chk )
Verify the SSH daemon performs strict mode checking of home directory configuration files.

Check that the SSH daemon performs strict mode checking of home directory configuration files with the following command:

# grep StrictModes /etc/ssh/sshd_config

StrictModes yes

If "StrictModes" is set to "no", is missing, or the returned line is commented out, this is a finding.
Fix Text (F-82477r2_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