Vulnerability Discussion

The "/etc/shadow-" file is a backup file of "/etc/shadow", and as such, contains the list of local system accounts and password hashes. Protection of this file is critical for system security.

Check

Verify the group ownership of the "/etc/shadow-" file with the following command:

$ sudo stat -c "%G %n" /etc/shadow-

root /etc/shadow-

If "/etc/shadow-" file does not have a group owner of "root", this is a finding.

Fix

Change the group of the file /etc/shadow- to root by running the following command:

$ sudo chgrp root /etc/shadow-