This is by design. The policykit-desktop-privileges package contains a policykit file that allows administrative users to do so:
from /var/lib/polkit-1/localauthority/10-vendor.d/com.ubuntu.desktop.pkla: [Setting the clock] Identity=unix-group:admin;unix-group:sudo Action=org.gnome.clockapplet.mechanism.*;org.gnome.controlcenter.datetime.config ure;org.kde.kcontrol.kcmclock.save ResultActive=yes ** Information type changed from Private Security to Public ** Changed in: unity Status: New => Invalid ** Changed in: gnome-control-center (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1219337 Title: Users can change the clock without authenticating, allowing them to locally exploit sudo. To manage notifications about this bug go to: https://bugs.launchpad.net/cinnamon-desktop/+bug/1219337/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs