Karotz Smart Rabbit Hijacking / Cleartext Token

Type packetstorm
Reporter Dan Crowley
Modified 2013-08-02T00:00:00


                                            `Trustwave SpiderLabs Security Advisory TWSL2013-021:  
Multiple Vulnerabilities in Karotz Smart Rabbit  
Published: 08/01/13  
Version: 1.0  
Vendor: Electronic Arts (http://www.ea.com/), formerly Mindscape, formerly Violet  
Product: Karotz  
Version affected:  
Product description:  
Karotz is the successor to the "Nabaztag". Nabaztag is a Wi-Fi enabled  
ambient electronic device in the shape of a rabbit, invented by Rafi  
Haladjian and Olivier Mével, and manufactured by the company Violet.[1]  
Nabaztag was designed to be a "smart object" comparable to those  
manufactured by Ambient Devices; it can connect to the Internet (to  
download weather forecasts, read its owner's email, etc.). It is also  
customizable and programmable to an extent.  
Finding 1: Python Module Hijacking  
*****Credit: Daniel Crowley of Trustwave SpiderLabs  
CVE: CVE-2013-4867  
CWE: CWE-427  
During the setup process for a Karotz unit, if wifi is selected as the  
method used to connect to the Internet, a python script named "autorunwifi"  
is run as root to set up the wifi connectivity. This file, along with  
several others, is placed in the root of a USB flash drive or hard drive.  
Another file, named "autorunwifi.sig", contains a signature of autorunwifi  
signed with the private key for Violet, to prevent modifications to the  
"autorunwifi" script.  
Since Python first attempts to load modules not built into Python from the  
same directory as the invoked script, it is possible to override the  
functionality of imported modules by placing a file with the same basename  
as the module being imported and an extension of ".py". In this case, it is  
possible to write a Python script named "simplejson.py" and place it in the  
same directory as the other setup files, which will cause the contents of  
simplejson.py to be executed at the beginning of the "autorunwifi" script  
This attack requires a USB flash drive to be plugged into the Karotz unit,  
and requires the Karotz to be turned off and on.  
The following is a proof of concept "simplejson.py" file that will copy the  
pubring.gpg file from the Karotz onto the inserted USB key, which is  
processed with MD5 to produce the key used to decrypt the root filesystem  
for the Karotz:  
## simplejson.py  
import os  
os.system("cp /karotz/etc/gpg/pubring.gpg /mnt/usbkey")  
## end simplejson.py  
Finding 2: API Session Token Passed in Cleartext  
*****Credit: Daniel Crowley of Trustwave SpiderLabs  
CVE: CVE-2013-4868  
There are two kinds of applications for the Karotz: hosted and external.  
Hosted applications are stored and run on the Karotz itself. External  
applications run outside the Karotz unit and control the Karotz through an  
api at api.karotz.com. Both types of applications must specifically request  
to use parts of the karotz in the manifest file of their application  
package. For instance, if your application uses the webcam and ears, you  
must specify in your application manifest that these will be used by your  
application before they will be available to your application.  
The control is performed over plaintext HTTP. As such, the session token  
authenticating API calls used to control the Karotz is available to an  
eavesdropping attacker. The session token can be used to perform any remote  
API call available to the application. For instance, if the application  
uses the webcam, a video could be captured using the webcam and sent to an  
arbitrary server.  
Vendor Response:  
No response received.  
Remediation Steps:  
No official patch is available. To limit exposure,  
network access to these devices should be limited to authorized  
personnel through the use of Access Control Lists and proper  
network segmentation.  
Revision History:  
06/19/13 - Attempt to contact vendor  
07/10/13 - Attempt to contact vendor  
07/12/13 - Attempt to contact vendor  
08/01/13 - Advisory published  
Additional Credits:  
Discussion of Python module loading behavior and initial suggestion of  
application to Karotz by Jennifer Savage  
1. http://www.karotz.com  
2. http://savagejen.github.io/blog/2013/04/28/python-module-hijacking/  
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