KATHREIN UFSconnect 916 / 906 DoS / Unauthenticated Actions
Posted on 01 August 2017
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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/Career.htm Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/About/Contact.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF T. Weber / @2017
