CVE-2020-27640 : What You Need to Know

Mitel MiVoice 6940 and 6930 MiNet phones with firmware before 1.5.3 are vulnerable to a Bluetooth pairing issue that could allow unauthorized access within Bluetooth range.

Understanding CVE-2020-27640

The vulnerability in Mitel MiVoice phones could enable an attacker to pair a rogue Bluetooth device when the phone handset loses connection, potentially leading to eavesdropping on conversations.

What is CVE-2020-27640?

The Bluetooth handset of Mitel MiVoice 6940 and 6930 MiNet phones with firmware before 1.5.3 is susceptible to an improper pairing mechanism, allowing an unauthenticated attacker within Bluetooth range to pair a rogue Bluetooth device.

The Impact of CVE-2020-27640

If exploited, this vulnerability could result in unauthorized access to sensitive conversations and potential eavesdropping by malicious actors.

Technical Details of CVE-2020-27640

Mitel MiVoice phones with firmware versions prior to 1.5.3 are affected by this Bluetooth pairing vulnerability.

Vulnerability Description

The flaw allows an attacker within Bluetooth range to pair a rogue device when the phone handset loses connection due to an improper pairing mechanism.

Affected Systems and Versions

Mitel MiVoice 6940 and 6930 MiNet phones with firmware versions before 1.5.3

Exploitation Mechanism

An unauthenticated attacker within Bluetooth range can exploit the vulnerability to pair a rogue Bluetooth device.

Mitigation and Prevention

Mitel users should take immediate steps to secure their devices and communications.

Immediate Steps to Take

Update Mitel MiVoice 6940 and 6930 MiNet phones to firmware version 1.5.3 or later.
Avoid using Bluetooth in public or unsecured environments.
Regularly monitor for unauthorized Bluetooth connections.

Long-Term Security Practices

Implement strong Bluetooth security protocols and encryption.
Train users on Bluetooth security best practices to prevent unauthorized pairing.

Patching and Updates

Mitel has released firmware version 1.5.3 to address this vulnerability. Users should promptly update their devices to the latest firmware.