-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2016-068 Product: Wireless Keyboard Set LX901 Manufacturer: Fujitsu Affected Version(s): Model No. GK900 Tested Version(s): Model No. GK900 Vulnerability Type: Cryptographic Issues (CWE-310) Missing Protection against Replay Attacks Risk Level: Medium Solution Status: Open Manufacturer Notification: 2016-07-07 Solution Date: - Public Disclosure: 2016-10-05 CVE Reference: Not yet assigned Authors of Advisory: Matthias Deeg and Gerhard Klostermeier (SySS GmbH) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: Fujitsu Wireless Keyboard Set LX901 is a wireless desktop set consisting of a mouse and a keyboard. The manufacturer describes the product as follows (see [1]): "The Wireless Keyboard LX901 is a top of the line desktop solution for lifestyle orientated customers, who want only the best for their desk. This superb keyboard set offers ambitious users more functions, security and better features than a conventional interface device. It even includes 2.4 GHz technology and 128 AES encryption for security." Due to an insecure implementation of the encrypted data communication, the wireless keyboard LX901 is vulnerable to replay attacks. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: The SySS GmbH found out that the wireless keyboard Fujitsu LX901 is prone to replay attacks. An attacker can sniff the AES-encrypted data packets of the 2.4 GHz radio communication sent by the keyboard to the receiver (USB dongle) and replay the recorded communication data at will causing the same effect as the original data communication. A replay attack against the keyboard can, for example, be used to gain unauthorized access to a computer system that is operated with a vulnerable Fujitsu LX901 keyboard. In this attack scenario, an attacker records the radio communication during a password-based user authentication of his or her victim, for instance during a login to the operating system or during unlocking a screen lock. At an opportune moment when the victim's computer system is unattended, the attacker approaches the victim's computer and replays the previously recorded AES-encrypted data communication for the password-based user authentication and thereby gets unauthorized access to the victim's system. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): The SySS GmbH could successfully perform a replay attack as described in the previous section using a software-defined radio in combination with the software tool GNU Radio Companion. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: According to information from the manufacturer Fujitsu, the reported security issue will currently not be fixed in affected products. The written statement in German from Fujitsu regarding this security issue is as follows: "Vielen Dank fur Ihre Informationen zu unserer Funktastatur. Wie Ihnen bereits mitgeteilt, halten wir das von Ihnen beschriebene Angriffsszenario bei unserer Tastatur aufgrund des verwendeten Funkprotokolls unter realen Bedingungen fur nicht so einfach durchfuhrbar. Wie erwahnt, verkaufen wir mit unserer Tastatur keine Sicherheitslosung, sondern eine Komfortlosung (ohne gravierende Sicherheitsnachteile wie bei unverschlusselten Wireless-Tastaturen). In einem bereits geplanten Nachfolgeprodukt werden alle neuen Erkenntnisse zur sicheren Datenubertragung bei Funktastaturen einfliessen." The English translation of this statement is as follows: "Thank you very much for your information about our wireless keyboard. As we have already pointed out, we believe that the described scenario is not easy to perform under real conditions due to the radio protocol used. As mentioned, our product is not destined to sell security, but convenience in the first place (without the security drawbacks of unencrypted wireless keyboards). Any new information and insights will be incorporated into the already planned successor product." ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2016-07-07: Vulnerability reported to manufacturer 2016-07-08: Manufacturer acknowledges e-mail with SySS security advisory 2016-08-02: E-mail from manufacturer requesting further information 2016-08-04: Provided further information to manufacturer via e-mail 2016-08-05: E-mail from manufacturer with further questions 2016-08-08: E-mail to manufacturer with answers to open questions 2016-08-12: E-mail from manufacturer with statement regarding the reported security issue 2016-10-05: Public release of the security advisory ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Product website for Fujitsu Wireless Keyboard Set http://www.fujitsu.com/global/products/computing/peripheral/accessories/input-devices/keyboards/wl-keyboard-lx901.html [2] SySS Security Advisory SYSS-2016-068 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2016-068.txt [3] SySS Responsible Disclosure Policy https://www.syss.de/en/responsible-disclosure-policy/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Matthias Deeg and Gerhard Klostermeier of the SySS GmbH. E-Mail: matthias.deeg (at) syss.de Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Matthias_Deeg.asc Key fingerprint = D1F0 A035 F06C E675 CDB9 0514 D9A4 BF6A 34AD 4DAB E-Mail: gerhard.klostermeier (at) syss.de Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Gerhard_Klostermeier.asc Key fingerprint = 8A9E 75CC D510 4FF6 8DB5 CC30 3802 3AAB 573E B2E7 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclaimer: The information provided in this security advisory is provided "as is" and without warranty of any kind. Details of this security advisory may be updated in order to provide as accurate information as possible. The latest version of this security advisory is available on the SySS Web site. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Copyright: Creative Commons - Attribution (by) - Version 3.0 URL: http://creativecommons.org/licenses/by/3.0/deed.en -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJX9MPdAAoJENmkv2o0rU2rYSMP/i0VFjxP094ZXY13wjEhTMw6 FMw27uLkw4oN86iYUKAyw3ulprTtDvhs+eXfwH9y9bZXGPvZOb5QzvTGu/Yy8CVQ ed5p0n/a0zfa+4MBTmtRap/7tIQkXuOXXoQPGyu3mSHP87rJKCq81E0sRxGOd7C9 tLhvfFEXKPiLwo9eDObpWNcy28U/b31W7Yqdj87mYQ6xMuBWVkkTR2W6CM7oU1D1 B2sY7zFsPpEttypGRkGjEP9WNU95B+i0PdL6vBWq1xXh+9QJn5QmwpdY+c0oKInv t8wWiRdCDDfBscq31F5cLngGCwihAcandc4nxf7F2egWw5pay9bHPzF3AqplqB7L HFtQ8FMf5oukt6j4YddXp1FIdtct7Y/RIlisbIyJQzP7B7HYb6Adep8kurd+K7Up qRlfk6Mx6c+eQvZQlM+y0QF2m63PRUmy5tRS/sSM2FbOWrczcsioZoBqHHUBuvxh lku77LB6L7rc/Oex640LhhvhnbJKzpX3mrdpKZX442Ugrbz8sQz8Y9wVdCu53hGR EwyUBW3WHcHCs565dVdQgnsQbIs47gL4vqIChMjsoSaG9JvmZuYf8taY0r7p6Kta qI/OxU0rawowL4xiK0xDOMySiBxyuHacL6Wg5LI+aHpKwVXQp8QIsMKKmexfgmOQ UUNiEnPRhMW3EgsFhTY7 =HLOb -----END PGP SIGNATURE-----