A somewhat sensible workaround I can find at the moment is to force re-
authentication every time you type sudo. The way to do this is by
adding:

Defaults timestamp_timeout=0

to the Defaults section of your /etc/sudoers

This will work on Ubuntu, OS X, and other variants.

Details can be found in http://www.sudo.ws/sudoers.man.html

We really shouldn't be trusting the clock to being with. The fact that
Ubuntu developers have seen fit to add "convenience features" to bypass
security rather proves the point.

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https://bugs.launchpad.net/bugs/1219337

Title:
  Users can change the clock without authenticating, allowing them to
  locally exploit sudo.

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