-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2016-058 Product: CHERRY B.UNLIMITED AES Manufacturer: Cherry GmbH Affected Version(s): JD-0400EU-2/01 Tested Version(s): JD-0400EU-2/01 Vulnerability Type: Insufficient Verification of Data Authenticity (CWE-345) Mouse Spoofing Attack Risk Level: Medium Solution Status: Open Manufacturer Notification: 2016-06-28 Solution Date: - Public Disclosure: 2016-09-30 CVE Reference: Not yet assigned Authors of Advisory: Matthias Deeg and Gerhard Klostermeier (SySS GmbH) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: CHERRY B.UNLIMITED AES is a wireless desktop set consisting of a mouse and a keyboard. The manufacturer describes the product as follows (see [1]): "CHERRY B. UNLIMITED AES combines secure data transmission and an advanced energy supply in a design which has been thought through to the very last detail. For high professional requirements and security both at home and in the workplace." Some of the key benefits of CHERRY B.UNLIMITED AES are (see [2]): * Data transmission using 128-bit encryption, complying to Advanced Encryption Standard (AES) * USB cable charging function for both keyboard & mouse - even when in use * High-quality, pre-charged NiMH batteries from GP with a very low self-discharge * Almost interference-free wireless 2.4 GHz technology (range of up to 10 metres) * 3-button mouse: infrared sensor and adjustable resolution (1,000/2,000 dpi) with ergonomic side panels * Multi-station capability operation of several wireless products in one room * Easy to install, requiring no technical knowledge * Mini USB receiver * Keyboard awarded the "Blauer Engel" environmental seal Due to unencrypted and unauthenticated mouse data communication, the wireless desktop set CHERRY B.UNLIMITED AES is prone to mouse spoofing attacks. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: The SySS GmbH found out that the mouse of the wireless desktop set CHERRY B.UNLIMITED AES is prone to spoofing attacks, as the mouse data communication is unencrypted and unauthenticated. An attacker can analyze the unencrypted mouse data packets of the 2.4 GHz radio communication sent by the mouse to the receiver (USB dongle) in order to learn the used protocol. By knowing the used mouse data protocol, it is possible to spoof mouse actions like mouse movements or mouse clicks by sending forged data packets. Thus, an attacker is able to remotely control the mouse pointer of a target system that is operated with the wireless desktop set CHERRY B.UNLIMITED AES. If the graphical user interface of the victim's system is unlocked, an attacker can for example send a list of mouse actions that start the virtual on-screen keyboard of the operating system and execute arbitrary commands in the context of the currently logged in user, for instance a download and execute attack vector. As the attacker may not have an unobstructed view to the target system's screen and may not know the used operating system, the screen resolution, or the current mouse settings, this kind mouse spoofing attack is based on heuristics. But concerning an unlocked and unattended system, an attacker can simply try different attack vectors for different target system configurations sequentially. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): The SySS GmbH could successfully perform mouse spoofing attacks against a target system operated with the wireless desktop set CHERRY B.UNLIMITED AES using an in-house developed software tool in combination with the USB radio dongle Crazyradio PA (see [3]). A proof-of-concept mouse spoofing attack resulting in remote code execution using the SySS software tool Radioactive Mouse is demonstrated in a video (see [4]). ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: The SySS GmbH is not aware of a solution for this reported security vulnerability. For further information please contact the manufacturer. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2016-06-28: Vulnerability reported to manufacturer 2016-09-30: Public release of the security advisory ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Data sheet for CHERRY B.UNLIMITED AES http://cherry.de/PDF/EN_CHERRY_B_UNLIMITED_AES.pdf [2] Product website for CHERRY B.UNLIMITED AES http://cherry.de/cid/wireless_keyboards_CHERRY_B_UNLIMITED_AES.htm?rdeLocaleAttr=en&WT.mc_id= [3] Product website for Crazyradio PA https://www.bitcraze.io/crazyradio-pa/ [4] SySS Proof-of-Concept Mouse Spoofing Attack Video https://www.youtube.com/watch?v=PkR8EODee44 [5] SySS Security Advisory SYSS-2016-058 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2016-058.txt [6] 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----- iQIcBAEBCgAGBQJX7ilTAAoJENmkv2o0rU2rPzIP+wXaPWtlbQvNc/cHje8KG+T9 uxktTLN8F/cYoND0niUejBp75CGjMC+9JTzv5B61iPko40ebxMB6RbrClSzNI1K9 CgrO2ZejqAgVp8tHutsTTUy+m1Me3YrpZwv4Tv1LxFWsorjJh1nfutXbEL0p2cSW thr57PtYmj+XVFKGYn9R9c54z1kL7iqwddQIWh+vzYpnCgkzd5ANgRHKYChSr+rf ZjnLlzsJqtFeKCIyJIdmqvZPE3RMM5mw2BIK11PPB+iRpxVOhAoHBLgNmD1xs82T XJKqQidCi/2aoMuZ/9phDVOk2+Q46sic5wkiPUYxrKYTdVrCXx0q3tG3wgOn9lPZ dc1Xkvd1uuNcklQHrqwe2MwuHZuhfKqrQzEoYRYchqS3jQgnNFTKE3BMSv84bLHj GVhdqLurn9/9LVdW38ZUJoLPj53eEFtyAxRzyaAU99OFD1WnRg+UYjpWjee//GJ6 WLaXmqAzxZ6nL+wgsa5zVP9WKM7XDBwOlg7SAnBmlZpqyI5iCz/hUqOiRDB22FV9 r8d2wTvgfuX32qTYAq6ZFkCA5ogcg5oy479dtnLC6qSwY0BIAR4ND4DT1YLXLrzs 0cE4Zps/jvOERxKiLz7ID1q31rLHcPAaK/gun9hHhamVGxDZm0GfjJUc+O2WI52y oTrTDSc5uVdQreLiR59R =3fbf -----END PGP SIGNATURE-----