Friday, 20 June 2008

Craig Wright Security Advisory 0002

I. BACKGROUND

The Oral B Triumph Toothbrush with SmartGuide™
ProfessionalCare™ 9900 is designed to enhance your brushing experience with “while-you-brush” feedback. SmartGuide is designed to ensure that you always have the best brushing experience.

http://www.oralb.com/us/products/power/triumphsmartguide/

II. DESCRIPTION

Remote exploitation of an information disclosure vulnerability in Oral B’s SmartGuide management system allows attackers to obtain sensitive information.

This vulnerability exists due to a lack of authentication between the toothbrush and the monitor device.

There is also a possible wireless denial of service where a malicious attacker could stop the radio feedback and monitoring.

III. ANALYSIS

Exploitation allows an attacker to gain sensitive information from the toothbrush. No authentication is required to reach the affected application. The attacker only needs to be able to monitor the wireless transmission.

The attacker can determine the users brushing habits. It is possible to report on the location of the mouth that is being brushed and the amount of time spent on each of four defined “quantrants”.

An attacker could also conduct a serious DoS attack. Flooding the wireless communications causes the unit to stop responding. This can result in the following actions:
A. A continued DoS could cause the bristle monitor to not send an end of life signal to the SmartMonitor system leaving the user to continue using an old toothbrush head which could eventually lead to dental failure. The failure to monitor the most effective head life could result in bristle failure.
B. Dental statistics could be erased from the monitor unit. This would leave the user unable to determine and report on their brushing habits.
C. Fake battery life transmissions can be sent making the user believe that the battery life is in fact longer than is truly stored. This could lead to a catastrophic brushing failure where the toothbrush runs out of power in mid-clean. A continued long term attack could lead to the creation of cavities in the user’s teeth.

IV. DETECTION

The DoS attack is readily detectable as the toothbrush rails to communicate to the monitoring unit.

Monitoring and interception remains undetectable with no known means to monitor this insidious threat to user brushing privacy.

V. WORKAROUND

The vendor has a deactivation process that will allow the toothbrush to operate manually with the radio disabled.

VI. VENDOR RESPONSE

I was unable to get an adequate result from the vendor and the receptionist did not forward the calls after the first few. A direct call to the sales channel resulted in the comment, “who the hell would want to monitor a toothbrush”.

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has not assigned a name to this issue as yet.

VIII. DISCLOSURE TIMELINE

19/06/2008 Initial vendor notification
19/06/2008 Initial vendor response
19/06/2008 Coordinated public disclosure

IX. CREDIT

Permission is granted for the redistribution of this alert electronically

Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition.

There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.

1 comment:

Miyazaki said...

This is why I have never upgraded to an electronic toothbrush. My dental security is too valuable. Just try hacking my analog brush.

[Hahahaha, thanks for the laugh.]