KATHREIN UFSconnect 916 906 DoS Unauthenticated Actions

SEC Consult Vulnerability Lab Security Advisory < 20170727-1 >
=========================& SEC Consult Vulnerability Lab Security Advisory < 20170727-1 >
=======================================================================
title: Multiple vulnerabilities
product: KATHREIN - UFSconnect 916, UFSconnect 906
vulnerable version: 2.23 Build 224, 2.22 Build 349
fixed version: -
CVE number:
impact: High
homepage: https://www.kathrein.com/de/
found: 2017-03-06
by: T. Weber (Office Vienna)
SEC Consult Vulnerability Lab

An integrated part of SEC Consult
Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow
Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich

https://www.sec-consult.com

=======================================================================

Vendor description:
-------------------
"As a globally leading specialist, Kathrein has unique know-how: our
business fields cover a wide range of communication technologies. They
produce intelligent solutions for the connected world a and clearly aim to
remain a step ahead. We think ahead to the future of communication
technology."

Source: https://www.kathrein.com/en/company/business-fields/

Business recommendation:
------------------------
The Kathrein receiver series can be controlled via its web interface. It is
intended to control this device also via internet over the Kathrein android
or iOS App. Missing authentication enables an attacker to control all Kathrein
UFS receivers over the web interface via port 9000/TCP. Actions like switch
channel, power off or increase/decrease volume are only few examples. An
attacker can also stream channels via port 49152/TCP or a dynamic defined UDP
port which depends on the content of the downloaded 'T*.asx' file.

SEC Consult recommends not to forward any port of this device to the internet
until a thorough security review has been performed by security professionals
and all identified issues have been resolved.

Upgrade to newer hardware is recommended since this product line is
end-of-life and not longer supported by Kathrein.

Vulnerability overview/description:
-----------------------------------
1) Unauthenticated root access by default
An attacker can login to the device without password as "root". Botnets
are mostly built by such weak default settings.

2) Denial of Service (DoS)
The receiver can be restarted by killing the web-service on the device from
remote. This results in a connection loss between the TV and the receiver
itself.

3) Unauthenticated Control of Receiver over the Network
The receiver can be controlled via web-service by GET-requests. An attacker
is able to do the following actions without authentication:
-) Switch the channel
-) Record on a channel
-) Delete records
-) Restart the receiver
-) Watch live-streams by using another UDP-port

Proof of concept:
-----------------
The vendor stated that the product line is end-of-life, hence there is no fix
available. The proof of concept has been removed from this advisory.

Vulnerable / tested versions:
-----------------------------
UFSconnect 916 Firmware 2.23 Build 224

The firmware of UFSconnect 906 (2.22 Build 349) is partially equal and very
similar to the firmware of UFSconnect 916 (2.23 Build 224).

Based on results of the SEC Technologies IoT Inspector
(http://www.iot-inspector.com/ -
automated firmware analysis tool) we believe that UFSconnect 906
(2.22 Build 349) is also prone to the identified vulnerabilities as well as
UFSconnect 916 (2.23 Build 224).

Since controlling the receiver is possible via the Kathrein UFScontrol app
on different UFS models, we believe that the following products are also prone
to 3) too:
UFS 912, UFS 913, UFS 922, UFS 923, UFS 924, UFS 925, UFS 935, UFS 946


Vendor contact timeline:
------------------------
2017-03-21: Sending advisory via secure file-upload to the vendor.
2017-06-07: Asked for status update.
2017-06-09: Vendor answered that he will be reachable at 2017-06-12.
2017-06-12: Call with vendor. Product line is end-of-life (EOL), no fix is
planned. Informing vendor that the advisory will be published
without PoC on 2017-07-27.
2017-07-27: Coordinated release of advisory.

Solution:
---------
Upgrade to newer hardware.


Workaround:
-----------
Set a password for the "root" user.
There is no workaround for the vulnerable web service. Restrict network
access of web service. Do not expose this service to the internet.

Advisory URL:
-------------
https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm


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EOF T. Weber / @2017