Date: Fri, 8 Aug 2014 20:09:53 +0400 From: gremlin@...mlin.ru To: oss-security@...ts.openwall.com Subject: Re: BadUSB discussion On 08-Aug-2014 08:18:21 -0700, Greg KH wrote: >> That means, every device after being detected by the system must >> be explicitly activated by some human activity. Yes, users may >> and, most likely, will be fooled to do that (as they are fooled >> to connect the attacker's device), but this activation will at >> least make the use of untrusted devices more difficult. > How can I activate a USB keyboard (the only input device attached > to the system), with the USB keyboard that I plugged into it? I've mentioned this issue in the message you've replied to. Possible solution could be whitelisting physical ports, but... > Again, fix the real problem here, if there is one, don't try > to throw "is this device ok to use" dialogs up, they just annoy > people and don't do anything. "Yes, yes, yes..." without reading the message. I know that. > Oh, and if you want, you can disable all USB devices on your > Linux system by default, and only "authorize" them explicitly > if you programatically think they should be enabled. We have > had support in the kernel for that for years now, but very few > people actually use it. I've faced that only once, and my solution was straightforward: those two servers were running a kernel built with only basic USB HID support (keyboard+mouse, IIRC) and without module load support. That appeared to be quite enough. > So the tools to do this are already there, why aren't you using > them? :) You could guess: sometimes I'm developing USB devices and have to test them. That formed a good habit of connecting my devices to a hub instead of directly to BB :-) -- Alexey V. Vissarionov aka Gremlin from Kremlin <gremlin ПРИ gremlin ТЧК ru> GPG: 8832FE9FA791F7968AC96E4E909DAC45EF3B1FA8 @ hkp://keys.gnupg.net
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