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 that the "/etc/shadow-" file has mode "0000" with the following command:
$ sudo stat -c "%a %n" /etc/shadow-
0 /etc/shadow-
If a value of "0" is not returned, this is a finding.
Fix
Change the mode of the file "/etc/shadow-" to "0000" by running the following command:
$ sudo chmod 0000 /etc/shadow-