Mitel Product Security Advisory 20-0013

Mitel MiVoice SIP, MiNet and DECT Phones Information Disclosure (KNOB) Vulnerability

Advisory ID: 20-0013

Publish Date: 2020-11-02

Last Updated: 2020-11-02

Revision: 1.0

Summary

Bluetooth enabled Mitel MiVoice 6940, 6930 and 6873i SIP and MiNet phones could allow an attacker to conduct brute-force attacks, which is also known as a “KNOB” attack. If successful, this attack can decrypt and eavesdrop on communications. This is due to Bluetooth industry specifications that allowed low encryption key length and does not prevent an attacker from influencing the key length negotiation between two Bluetooth devices.

This vulnerability was discovered by security researchers and potentially affects all Bluetooth devices. To address this vulnerability, the Bluetooth specifications have been updated by the industry consortium, Bluetooth SIG (Special Interest Group). Mitel has implemented these updated specifications in affected products listed below.

Mitel is recommending customers with affected product versions to update to the latest release.

Affected Products

Product Name

Product Version

Security Bulletin

Last Updated

Mitel MiVoice 6873i, 6930 and 6940 SIP phones

Firmware versions 5.1.0 SP5 and earlier

20-0013-001

2020-11-02

Mitel MiVoice 6930 and 6940 MiNet phones

Firmware versions 1.5.2 SP1 and earlier

20-0013-002

2020-11-02

Mitel 632v2 and 622v2 DECT phones

Firmware versions 7.4.0 and earlier

20-0013-003

2020-11-02

Risk Assessment

The risk for this vulnerability is rated from Medium to High. Refer to the product Security Bulletins for additional statements regarding risk.

Mitigation / Recommended Action

Mitel has issued new releases of the affected software. Customers are advised to update their software to the latest versions.

To successfully exploit this vulnerability the attacker’s device must be in proximity (within Bluetooth range) of two vulnerable Bluetooth devices. In addition, the attacker must successfully execute a Man-in-the-Middle attack within a narrow time window while both vulnerable devices are initiating Bluetooth pairing.

Customers are advised to review the product Security Bulletin. For additional information, contact Product Support.

External References

CVE-2019-9506

VU#918987

Related CVEs / CWEs / Advisories

CVE-2019-9506

Revision History

Version

Date

Description

1.0

2020-11-02

Initial version