Vulnerability Summary
TLS 1.0 is no longer considered a secure protocol and there are a number of vulnerabilities associated with it. Guidance from many software and browser vendors is to disable TLS 1.0. The Polycom HDX, now end of sale and support, offers TLS 1.0 on SIP and the web interface connections but it can be disabled for SIP communications by running telnet commands.
Please note that this change only changes the TLS settings for SIP communications. We have mitigated port 443 using the empty fragment mitigation in the TLSv1.0 + CBC cipher case where HDX prepends a record with an empty plaintext fragment before sending the actual payload.
Published
Last Update: 3/8/2022
Initial Public Release: 3/9/2020
Advisory ID: PLYTV20-03
Product Affected
| PRODUCTS | FIRMWARE | FIX |
|---|---|---|
| HDX 4000 | Prior to 3.1.11 |
3.1.11 and above |
| HDX 6000 | Prior to 3.1.11 |
3.1.11 and above |
| HDX 7000 | Prior to 3.1.11 |
3.1.11 and above |
| HDX 8000 | Prior to 3.1.11 |
3.1.11 and above |
| HDX 9000 | Prior to 3.1.11 |
3.1.11 and above |
Solution
HDX software 3.1.11 or higher will need to be installed for this command to work and it is strongly recommended that customers update to the latest release which can be found on Poly Support.
Telnet to the HDX endpoint and log into it with the admin login and password. Then, enter this command: systemsetting enabletlsv1 0 <enter> This disables TLS 1.0 on SIP communications
The HDX will reboot after you hit the enter key. Once it has rebooted, TLS 1.0 will be disabled for SIP communications. If you need to enable TLS 1.0 on SIP again, follow the same process but use this command: systemsetting enabletlsv1 1 <enter> This enables TLS 1.0 on SIP communications.
Note Regarding TLS 1.1
TLS 1.1 cannot be disabled on the HDX. Both it and TLS 1.2 will be offered on connections. The HDX family is end of life and no further development will be done on it.
Contact
Any customer using an affected system who is concerned about this vulnerability within their deployment should contact Poly Technical Support – (888) 248-4143, (916) 928-7561, or visit the Poly Support Site.
Revision History
| VERSION | DATE | DESCRIPTION |
|---|---|---|
| 1.0 | 9/7/2021 | Initial Release |
| 2.0 | 3/9/2022 | Format changes and Detail clarifications |