Subject: Re: 'shutdown' setuid?
To: Simon Burge <firstname.lastname@example.org>
From: Steven M. Bellovin <email@example.com>
Date: 12/03/2002 23:14:07
In message <20021204041140.8C72953E7F@thoreau.thistledown.com.au>, Simon Burge
>Steve Bellovin wrote:
>> Why is /sbin/shutdown setuid root on 1.6 and -current? (I haven't checked
>> any other versions.) The code ensures that it's running as root, which
>> is reasonable -- but if it's setuid, it always will be.
>> (I agree that on single-user machines, it's a reasonable thing to do.
>> But the owner can do that on a per-machine basis.)
>It's also only executable by group operator:
> -r-sr-xr-- 1 root operator 270144 Aug 4 01:14 /sbin/shutdown*
>so operator folk can reboot the computer.
Tnx -- I looked explicitly at that, and missed it.
--Steve Bellovin, http://www.research.att.com/~smb (me)
http://www.wilyhacker.com ("Firewalls" book)