Date: Mon, 2 Dec 2019 18:28:12 +0100 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Subject: Re: virtual consoles 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 the one logged in on the currently active virtual console, then I'd say it's a vulnerability on its own, regardless of the social engineering aspects you mention. Why does this functionality even exist? > Should this have some policykit action requirement, or require physical > presence? I don't know the answer. Maybe simply drop the misfeature? Alexander
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