Title

The Photon operating system must configure sshd to perform strict mode checking of home directory configuration files. (Cat II impact)

Discussion

If other users have access to modify user-specific Secure Shell (SSH) configuration files, they may be able to log on to the system as another user.

Check Content

At the command line, run the following command: # sshd -T|&grep -i StrictModes Expected result: StrictModes yes If the output does not match the expected result, this is a finding.

Fix Text

Navigate to and open: /etc/ssh/sshd_config Ensure the "StrictModes" line is uncommented and set to the following: StrictModes yes At the command line, run the following command: # systemctl restart sshd.service

Additional Identifiers

Rule ID: SV-256550r991589_rule

Vulnerability ID: V-256550

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.