Vulnerability Discussion
Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access.
Check
Verify RHEL 9 defines default permissions for all authenticated users in such a way that the user can only read and modify their own files with the following command:
Note: If the value of the "UMASK" parameter is set to "000" in "/etc/login.defs" file, the Severity is raised to a CAT I.
# grep -i umask /etc/login.defs
UMASK 077
If the value for the "UMASK" parameter is not "077", or the "UMASK" parameter is missing or is commented out, this is a finding.
Fix
Configure RHEL 9 to define default permissions for all authenticated users in such a way that the user can only read and modify their own files.
Add or edit the lines for the "UMASK" parameter in the "/etc/login.defs" file to "077":
UMASK 077