-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2019-021 Product: Cynap Manufacturer: WolfVision Affected Version(s): 1.18g, 1.28j Tested Version(s): 1.18g, 1.28j Vulnerability Type: Use of Hard-coded Cryptographic Key (CWE-321) Risk Level: High Solution Status: Fixed Manufacturer Notification: 2019-05-03 Solution Date: 2019-06-19 Public Disclosure: 2019-07-04 CVE Reference: Not assigned yet Authors of Advisory: Manuel Stotz, Gerhard Klostermeier (SySS GmbH) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Overview: WolfVision Cynap is a wireless collaboration and presentation system. The manufacturer describes the product as follows [1]: "Cynap is a stand-alone all-in-one wireless collaboration and presentation system which includes a built-in media player, web conferencing, on-board recording and streaming , BYOD screen sharing for all mobile devices, and annotation functionality, making it the ideal device to form the centrepiece of new and adapted classrooms and meeting spaces." Due to the use of a hard-coded cryptographic key, an attacker can generate support PINs for resetting the administrative user password in order to gain administrative access to the device. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: SySS GmbH found out that the WolfVision Cynap wireless collaboration and presentation system uses a static, hard-coded cryptographic secret for generating support PINs used for the provided 'forgot password' functionality. By knowing this static secret and the corresponding algorithm for calculating support PINs, an attacker can reset the password of the administrative user account "ADMIN" and thus gain unauthorized access to the affected Cynap device via a network connection. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): SySS GmbH developed a software tool for generating support PINs either in online or offline mode. The following output of the software tools illustrates a successful attack resulting in a reset password for the administrative user account "ADMIN". $ python ./wolfvision_cynap_keygen.py --online 192.168.40.109 WolfVision vSolution Cynap Keygen by Manuel Stotz Gerhard Klostermeier [*] Launch keygen in online mode ... [OK] [*] Gathering data ... [OK] [*] Serialnumber: <SERIAL NUMBER> [*] Support PIN: 447301 [*] Generating new Support PIN ... [OK] [+] New Support PIN: 723247 [*] Account: ADMIN [*] Password: Password [*] Bye! A successful attack against a vulnerable WolfVision Cynap device gaining administrative access is demonstrated in our SySS PoC video "Administrating WolfVision Cynap the Hacker's Way" [5]. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: Install the firmware version 1.30j provided by the manufacturer WolfVision [2]. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2019-05-03: Vulnerability reported to manufacturer 2019-05-10: Vulnerability reported to manufacturer again 2019-05-13: Manufacturer confirms receipt of security advisory 2019-05-31: Manufacturer schedules firmware update 1.30j with fix for the reported security issue 2019-06-19: Release of firmware update 1.30j including security fix 2019-07-04: Public release of SySS security advisory ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Product website for WolfVision Cynap https://www.wolfvision.com/vsolution/index.php/en/presentation-systems/cynap/cynap [2] WolfVision firmware downloads https://wolfvision.com/vsolution/index.php/de/support/downloads [3] SySS Security Advisory SYSS-2019-021 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2019-021.txt [4] SySS Responsible Disclosure Policy https://www.syss.de/en/responsible-disclosure-policy/ [5] SySS Proof-of-Concept Video "Administrating WolfVision Cynap the Hacker's Way" https://youtu.be/veEtiYAWvMY ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Manuel Stotz and Gerhard Klostermeier of SySS GmbH. E-Mail: manuel.stotz (at) syss.de Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Manuel_Stotz.asc Key fingerprint = F051 5B74 7E70 193E 7F66 0133 E790 F68A BCE6 8C6D 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----- iQIzBAEBCgAdFiEE0fCgNfBs5nXNuQUU2aS/ajStTasFAl0dqNIACgkQ2aS/ajSt TasDkQ/+IvddyxRw2qfOI9dnVzGMWWMENy9ZNqn/nji9FiuK2NBC0mAoUuTJQHwh ZR+tNwDZ4/RKA/DsQNsqNRocdpZ3qR6tQcw0FjGIA+7KCx10tjJ69Kk7k+yqUVen lBwcfJQYmaWMji7RcvzYxqVXzVOFPTQBokt/6XX4+XStZeWeeMoYbAYUKfwd5oAn NKHIfUA2SE+D2ghKWpXekm5WtF0ywVb4dSmRPpBTYpzPqQWJpscSoBBLs1RFlISa fMeo02iHD9DK4itcaUqRpdmT/aAtOXLMZ8ibAW1WoI7tWA1f0KbdEMJq2jIvNFUu fYPVlG+vjd8IkX4rRdVxpUsXbOo1aIBC4UvmN/DtDzIQ1XTz7kB42KN/M9Qbizuz RTNal9g3Ft9F9TKAVgnjFDszslnpc48+23oqW/JDXNV725zwDrpJDAxHdZHfAWVU 2as+uJlWNQ8dc/FCAIQRvCs82eiIslXP4Yxtwb7HVXIB3cZHP+SiMrqTIj0cD0uO CcjwGo2H8MS+ESL7DHw1eSXwSdy+kyTxoKW0WdTB/NZC/Ni/dYoOkhVoFbU0BTW1 oViuGHdXEBv72oVbE7U5WxR4izdeJ6ZnSxLPrCl9QMnmdR0gLyB9GawH9UbGvUJP 7HfvEDFy7l85yjsAgzeySA1NR7nsFPaQiTimI9YlBAckEELdw6s= =jPkC -----END PGP SIGNATURE-----