Hi email@example.com, (I suggest replies to usb@)
cc: freebsd-secur...@freebsd.org FYI
Ref. article on BadUSB pan OS (non FreeBSD specific) security loophole
Dated 6 October 2014 Last updated at 15:29 GMT
I found https://github.com/search?utf8=%E2%9C%93&q=BadUSB
Then viewed https://www.youtube.com/watch?v=nuruzFqMgIw
( Which BTW plays nicely inc. sound on FreeBSD-9.2-RELEASE
+ firefox without any flash installed (certainly no
A fascinating video by Lecturers Karsten Nohl & Jacob Lell at Black Hat
USA 2014, Run time 44:30 )
(PS for non native English spekers on this global list, dont worry if
you find Jacob's accent hard, Karsten resumes for last 3rd, listen on :-)
It seems USB controllers (8041 or so based) can first masquerade
one device, then pause & masquerade another device type. This is
an OS independent security list. Lecturers includes both demo of
an MS to Linux contamination, & consideration of other scenarios.
A predominant USB controller manufacturer in Taipei was not happy.
The lecturers didn't discuss MS or Linux or Android smart phone
protection schemes (except to allude to the danger of someone saying
"Can I plug in my smart phone to your PC to charge it ?".
It can't be ignored as a smart phone exploit: the demo wasn't with a
smart phone but a `dumb' stick.
One can't get some protection by checking for sernum connecting, as devd shows:
- my USB to PS2 adapter (vendor=0x04b4 product=0x8081) emits sernum=""
- my real USB "Havit" keyboard (vendor=0x1241 product=0x1203) emits sernum=""
I guess for serious security, every new device that is connected
& recognised by /sbin/devd should in future be personaly authorised
by a human ! One can no longer trust what reports itself to be
eg a keyboard to actually Be a keyboard, etc.
/usr/src/etc/devd/*.conf & my own .conf do Not meet that awkward
security requirement... yet. I guess we'll need a couple of hooks
that support Yes/No, one from cli & one for within X11.
There's no security warning section in
Julian Stacey, BSD Linux Unix'78 C Sys Eng Consultant Munich http://berklix.com
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