full-disclosure - usb shorting to ground

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Message-ID: <20071227100310.GA10839@rapidpacket.com>
Date: Thu, 27 Dec 2007 04:03:10 -0600
From: Todd Troxell <ttroxell@...ian.org>
To: full-disclosure@...ts.grok.org.uk
Subject: usb shorting to ground

I discovered rather inadvertently that laptops do not enjoy having their USB
VCC shorted to GND one bit. It is a sure DoS, in fact if the machine has a
stupid power supply, it could result in permanent damage. It is kind of scary
for kiosk machines like the those ubiquitous Kodak photo centers.

I give you, the usb pwner. It could even hide inside a legitimate stick:

USB Pwner schematic

VCC ------------
D+  ---(nc)    |
D   ---(nc)    |
GND ------------

-- 
Todd Troxell
http://rapidpacket.com/~xtat

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