This is by DESIGN?
Your design is that any user can change the time, and therefore bypass the 
security of sudo? 
What's the justification for not having the user enter a password to change the 
time? Convenience?

Marc, with all due respect, did you even read the bug?

"If you disable the sudo password for your account, you will seriously
compromise the security of your computer. Anyone sitting at your
unattended, logged in account will have complete Root access, and remote
exploits become much easier for malicious crackers."

This policy kit change adds a single condition: That the user has used
sudo to escalate at some point, and it creates /exactly/ the same
conditions.

I'm going to re-open this just to be sure. It seems incredible that
Ubuntu would intentionally let people bypass security like that.

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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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