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Message-ID: <20191202175043.GC28519@orca>
Date: Mon, 2 Dec 2019 17:50:43 +0000
From: Leonid Isaev <leonid.isaev@...x.com>
To: oss-security@...ts.openwall.com
Subject: Re: virtual consoles
On Mon, Dec 02, 2019 at 06:28:12PM +0100, Solar Designer wrote:
> On Mon, Dec 02, 2019 at 08:56:38AM -0800, Tavis Ormandy wrote:
> > Regardless of your position, this is certainly possible on desktop Linux
> > too, unprivileged users can start a new X server and switch virtual
> > console, even over ssh.
> >
> > e.g.
> >
> > $ dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1/seat/seat0 org.freedesktop.login1.Seat.SwitchTo uint32:2
> >
> > (note: object paths may vary by distro, change the 2 to a different
> > number if you're already on VT2, or seat0 if you're on a different seat)
>
> If this in fact works over SSH and from a user account different than
Yes, it does.
> Why does this functionality even exist?
Because of the same reason why I have dbus on a Spark compute node: systemd :)
> Maybe simply drop the misfeature?
That would break (at least) systemd user sessions I suppose...
Sincerely,
L.
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