Keurig 2.0 Genuine K-Cup Spoofing Vulnerability

[Nytro]

Keurig 2.0 Genuine K-Cup Spoofing Vulnerability From: Kenneth Buckler <kenneth.buckler () gmail com>

Date: Tue, 9 Dec 2014 13:04:20 -0500

*Overview*

Keurig 2.0 Coffee Maker contains a vulnerability in which the authenticity

of coffee pods, known as K-Cups, uses weak verification methods, which are

subject to a spoofing attack through re-use of a previously verified K-Cup.

*Impact*

CVSS Base Score: 4.9

Impact Subscore: 6.9

Exploitability Subscore: 3.9

Access Vector: Local

Access Complexity: Low

Authentication: None

Confidentiality Impact: None

Integrity Impact: Complete

Availability Impact: None

*Vulnerable Versions*

Keurig 2.0 Coffee Maker

*Technical Details*

Keurig 2.0 is designed to only use genuine Keurig approved coffee K-Cups.

However, a flaw in the verification method allows an attacker to use

unauthorized K-Cups. The Keurig 2.0 does verify that the K-Cup foil lid

used for verification is not re-used.

Step 1: Attacker uses a genuine K-Cup in the Keurig machine to brew coffee

or hot chocolate.

Step 2: After brewing is complete, attacker removes the genuine K-Cup from

the Keurig and uses a knife or scissors to carefully remove the full foil

lid from the K-Cup, ensuring to keep the full edges intact. Attacker keeps

this for use in the attack.

Step 3: Attacker inserts a non-genuine K-Cup in the Keurig, and closes the

lid. Attacker should receive an "oops" error message stating that the K-Cup

is not genuine.

Step 4: Attacker opens the Keurig, leaving the non-genuine K-Cup in the

Keurig, and carefully places the previously saved genuine K-Cup lid on top

of the non-genuine K-Cup, lining up the puncture hole to keep the lid in

place.

Step 5: Attacker closes the Keurig, and is able to brew coffee using the

non-genuine K-Cup.

Since no fix is currently available, owners of Keurig 2.0 systems may wish

to take additional steps to secure the device, such as keeping the device

in a locked cabinet, or using a cable lock to prevent the device from being

plugged in when not being used by an authorized user.

Please note that a proof of concept is already available online.

*Credit: *

Proof of concept at KeurigHack.com

Vulnerability Writeup by Ken Buckler, Caffeine Security

Caffeine Security

Video:

Sursa: Full Disclosure: Keurig 2.0 Genuine K-Cup Spoofing Vulnerability