ctrl-alt-del shuts down my system with user priveliges

crash88 · 06-30-2006, 04:03 PM

I've never seen this before in any *nix. My user, non-root, is able to ctrl-alt-del and shut the system down. What's a solution to this if there is one as this is obviously a security problem.

perfect_circle · 06-30-2006, 04:09 PM

Not sure if this works, haven't tried it but the ctrl+alt+del is controlled in /etc/inittab:

Code:

# What to do at the "Three Finger Salute".
ca::ctrlaltdel:/sbin/shutdown -t5 -r now

Try commenting out the whole line or removing the command

acid_kewpie · 06-30-2006, 04:11 PM

why is that a security problem? kinda subjective i guess. essentially ctrl+alt+del is defined in /etc/inittab, so you'd remove that. note that this is dealt with by the system in a non-user centric way.

bsdunix · 06-30-2006, 04:25 PM

A user has physical access to the box and your worried about CTL-ALT-DEL, they can just pull the power plug and be done with it.

crash88 · 06-30-2006, 09:56 PM

using dumb terminals etc would be a bad idea if someone on one could shut down the system causing people to lose unsaved work.

rad01 · 07-02-2006, 12:59 PM

But ctrl-alt-delete is only functional from the console, isn't it? Have you tried via a dumb terminal and found that it causes a reboot?

kodon · 07-02-2006, 03:07 PM

or you could chmod the privilege away
from users on /sbin/shutdown and leave
it available for root or a specified group