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bugtraq: RE: A more detailed description of the Jura F90 vulnera

RE: A more detailed description of the Jura F90 vulnerability.

From: Craig Wright <Craig.Wright_at_nospam>
Date: Wed Jun 18 2008 - 21:42:42 GMT
To: "Thor (Hammer of God)" <thor@hammerofgod.com>, "security-basics@lists.securityfocus.com" <security-basics@lists.securityfocus.com>, "bugtraq@securityfocus.com" <bugtraq@securityfocus.com>

I have attempted to. They are not the easiest company to contact. I am sending more details to the firm that tests their products. They seem to be a shell with a large number of outsourced arrangements.

Craig

Craig Wright
Manager, Risk Advisory Services

Direct : +61 2 9286 5497
Craig.Wright@bdo.com.au
+61 417 683 914

BDO Kendalls (NSW-VIC) Pty. Ltd.
Level 19, 2 Market Street Sydney NSW 2000 GPO BOX 2551 Sydney NSW 2001
Fax +61 2 9993 9497
http://www.bdo.com.au/

The information in this email and any attachments is confidential. If you are not the named addressee you must not read, print, copy, distribute, or use in any way this transmission or any information it contains. If you have received this message in error, please notify the sender by return email, destroy all copies and delete it from your system.

Any views expressed in this message are those of the individual sender and not necessarily endorsed by BDO Kendalls. You may not rely on this message as advice unless subsequently confirmed by fax or letter signed by a Partner or Director of BDO Kendalls. It is your responsibility to scan this communication and any files attached for computer viruses and other defects. BDO Kendalls does not accept liability for any loss or damage however caused which may result from this communication or any files attached. A full version of the BDO Kendalls disclaimer, and our Privacy statement, can be found on the BDO Kendalls website at http://www.bdo.com.au/ or by emailing mailto:administrator_at_bdo.com.au.

BDO Kendalls is a national association of separate partnerships and entities. Liability limited by a scheme approved under Professional Standards Legislation. -----Original Message-----

From: Thor (Hammer of God) [mailto:thor@hammerofgod.com] Sent: Thursday, 19 June 2008 3:11 AM
To: security-basics@lists.securityfocus.com; bugtraq@securityfocus.com Subject: RE: A more detailed description of the Jura F90 vulnerability.

Have you shared all of this with the manufacturer first?

t

> -----Original Message-----
> From: Craig Wright [mailto:Craig.Wright@bdo.com.au]
> Sent: Tuesday, June 17, 2008 11:10 PM
> To: security-basics@lists.securityfocus.com; bugtraq@securityfocus.com
> Subject: A more detailed description of the Jura F90 vulnerability.
>
>
> The issue is a lack of input validation. OWASP would be a great
> learning exercise for the coders on this product. It seems to be
> assumed that only trust-worthy users will connect only to trust-worthy
> sites. I could not find any evidence of input validation.
>
> Through the magic of Web Scarab and Paros proxy, one can capture the
> Internet communications used by the F90 Internet Connection Kit
> software. What you soon see is that the software does not account for
> either bypassing the local application and changing the input or in
> spoofed and re-directed sites.
>
> The software does not validate the site it gets the information from
> nor does it sufficiently validate the input to the software.
>
> At the moment as I think there are so few people as crazy as I am who
> actually have to have a gadget just as it is Internet connected; this
> is not likely to become a widespread attack vector.
>
> The software is an oversized web proxy with other stuff to connect to
> the coffee machine thrown in. Jura did not make the assumption that an
> evil attacker could purposefully modify and publish "evil" coffee
> "recipes.
>
> I have been taking the updated SANS@Home 610 course. I have a GREM,
but
> Lenny and the other guys have added an additional component to the
> Reverse Engineering Malware Course. So I had to take it.
>
> The course focuses on analysing and reversing malware, but IDA and
Olly
> work on binaries of all types and the bad combination of a bottle of
> good resiling and 9 coffees after midnight is not a good combination.
> Hence I decided to attack my coffee maker and the control software.
>
> There are certain aspects of code (like the ever faithful GETS()
> function) that should be beaten from existence. Others need to be
> securely configured such that all the required variable fields are
> entered correctly (see SPRINTF()). Unfortunately the coders at Jura
did
> not consider that "bad people" would ever attack a coffee maker ;).
>
> There are 2 main attacks that I have noted,
> 1 Loading a malicious setting or recipe into the device causing
a
> "coffee overflow" etc.
> 2 More seriously, not validating the input correctly coupled
with
> a lack of authorisation of the source and nothing to stop invalid data
> at the host means that malformed strings can be fed to the software
> that can either crash the system or if crafted correctly run a binary
> on the host.
>
> So, as most people who check this list I no doubt know, not validating
> input is bad. Trusting the web as you have a piece of custom software
> that is closed source and a belief that users are all nice is bad.
>
> Regards,
> Craig Wright GSE-Compliance
>
> PS for DMCA compliance reasons I would state that I was not reversing
> the software, but rather inputting unusual coffee recipes that had a
> strange binary flavour ;)
>
> Craig Wright
> Manager, Risk Advisory Services
>
> Direct : +61 2 9286 5497
> Craig.Wright@bdo.com.au
> +61 417 683 914
>
> BDO Kendalls (NSW-VIC) Pty. Ltd.
> Level 19, 2 Market Street Sydney NSW 2000
> GPO BOX 2551 Sydney NSW 2001
> Fax +61 2 9993 9497
> http://www.bdo.com.au/
>
> The information in this email and any attachments is confidential. If
> you are not the named addressee you must not read, print, copy,
> distribute, or use in any way this transmission or any information it
> contains. If you have received this message in error, please notify
the
> sender by return email, destroy all copies and delete it from your
> system.
>
> Any views expressed in this message are those of the individual sender
> and not necessarily endorsed by BDO Kendalls. You may not rely on this
> message as advice unless subsequently confirmed by fax or letter
signed
> by a Partner or Director of BDO Kendalls. It is your responsibility to
> scan this communication and any files attached for computer viruses
and
> other defects. BDO Kendalls does not accept liability for any loss or
> damage however caused which may result from this communication or any
> files attached. A full version of the BDO Kendalls disclaimer, and our
> Privacy statement, can be found on the BDO Kendalls website at
> http://www.bdo.com.au/ or by emailing mailto:administrator_at_bdo.com.au.
>
> BDO Kendalls is a national association of separate partnerships and
> entities. Liability limited by a scheme approved under Professional
> Standards Legislation.
>