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Not easily, I'm afraid. I suppose you could try using dpkg to do a reinstall of the base system packages and hope those reset the base directory permissions. Or, you can do it by hand, give /tmp and /var/tmp 1755 permission, /home/* 0700, etc, although, in all honesty, it's probably best just to reinstall.
Sounds like you've learned the lesson all *nix admins learn, which is to be careful with the superuser account.
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