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Date: Thu, 18 Feb 2010 17:41:19 +0100
From: Marcus Meissner <>
Subject: Re: CVE request: kernel information leak via userspace USB interface

On Thu, Feb 18, 2010 at 09:09:15AM +0800, Eugene Teo wrote:
> Hi Marcus,
> On 02/17/2010 06:29 PM, Marcus Meissner wrote:
> >While programming a USB device using libusb I found that a usb read from
> >the device returned data it should not.
> [...]
> >Access to USB userspace devices either requires root access or desktop 
> >user access
> >via udev/hal ACLs on non-mass-storage Digital Cameras or Media Players. 
> >(So the
> >desktop user needs to plugin such a ACL getting device before being able
> >to read the memory).
> To abuse this, you will need physical access to plug in a USB device, so 
> I do not think this should be regarded as a security issue.


Or you exploit the desktop user and then wait until he plugs in such a device
(ok, kind of a theoretical scenario, lets ignore).

Are we considering "giving desktop local users unintended rights"
a security issue or not?

(Hmm, init=/bin/sh booting and pressing reset might come into
 play here too. Then we would not consider that.)

Ciao, Marcus

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