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Vulnerability Summary
Two recent vulnerabilities have been identified in some Bluetooth enabled products. They are:
BIAS (CVE-2020-10135), a vulnerability in secure connection pairing in Bluetooth BR/EDR Core Specification v.5.2 and earlier which may allow an unauthenticated user to complete authentication without proper pairing credentials.
KNOB (CVE-2019-9506), a vulnerability in the Bluetooth BR/EDR Specification v.5.1 and earlier which is more susceptible to brute-force attacks potentially
Details
CVE 2020-10135 - BIAS
Legacy pairing and secure-connections pairing authentication in Bluetooth BR/EDR Core Specification v5.2 and earlier may allow an unauthenticated user to complete authentication without pairing credentials via adjacent access. An unauthenticated, adjacent attacker could impersonate a Bluetooth BR/EDR master or slave to pair with a previously paired remote device to successfully complete the authentication procedure without knowing the link key.
CVE 2019-9506 - KNOB
The Bluetooth BR/EDR specification up to and including version 5.1 permits sufficiently low encryption key length and does not prevent an attacker from influencing the key length negotiation. This allows practical brute-force attacks (aka "KNOB") that can decrypt traffic and inject arbitrary ciphertext without the victim noticing.
Poly released a firmware update to address this vulnerability. There is no workaround.
Published
Last Update: 3/8/2022
Initial Public Release: 7/21/2020
Advisory ID: PLYPL20-07
CVE ID: CVE-2020-10135
CVSS Score: 5.4
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVE ID: CVE-2019-9506
CVSS Score: 8.1
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Product Affected
| PRODUCTS | VERSION | NOTES |
|---|---|---|
| Calisto 3200/5300 | v66 |
Includes fix for BIAS and KNOB vulnerabilities |
| BT600 | v1723 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager 4200 UC Series | v520 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager 4200 Office Series | v323 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager 4245 Office | v77 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager 5200 UC | v508 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager 5200 Office | v323 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager 6200 UC | v706 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager 8200 UC | v667 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager Focus UC | v500 |
Includes fix for BIAS and KNOB vulnerabilities |
| Voyager Legend UC | v110 |
Includes fix for BIAS and KNOB vulnerabilities |
Solution
Poly has released firmware updates that contain fixes for these issues as well as other fixes and features. These can be installed via the Plantronics Hub software. Please refer to the Products Affected table for more information.
Workaround
There is no workaround.
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 | 7/21/2020 | Initial Release |
| 2.0 | 3/8/2022 | Format changes |
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