CVE-2020-26559: High severity Bluetooth Mesh profile vulnerability
Bluetooth Mesh Provisioning in the Bluetooth Mesh profile 1.0 and 1.0.1 may permit a nearby device (participating in the provisioning protocol) to identify the AuthValue used given the Provisioner’s public key, and the confirmation number and nonce provided by the provisioning device. This could permit a device without the AuthValue to complete provisioning without brute-forcing the AuthValue.
Other sources
The Mesh Provisioning procedure described in the Bluetooth Mesh Profile Specification versions 1.0 and 1.0.1 could allow an attacker that was provisioned without access to the AuthValue to identify the AuthValue directly without brute-forcing its value. Even when a randomly generated AuthValue with a full 128-bits of entropy is used, an attacker acquiring the Provisioner’s public key, provisioning confirmation value, and provisioning random value and providing its public key for use in the provisioning procedure will be able to directly compute the AuthValue used.
— Red Hat
Affected Software
Event History
Frequently Asked Questions
What is CVE-2020-26559?
CVE-2020-26559 is a vulnerability in the Bluetooth Mesh profile 1.0 and 1.0.1 that allows a nearby device participating in the provisioning protocol to identify the AuthValue used given the Provisioner’s public key, confirmation number, and nonce.
How severe is CVE-2020-26559?
CVE-2020-26559 has a severity score of 8.8 (high).
How does CVE-2020-26559 impact Bluetooth Mesh profile 1.0 and 1.0.1?
CVE-2020-26559 allows an attacker in proximity to identify the AuthValue used in the provisioning protocol of the Bluetooth Mesh profile 1.0 and 1.0.1.
How can I fix CVE-2020-26559?
There is currently no known fix or patch available for CVE-2020-26559. It is recommended to stay updated with the latest information from the vendor and follow any mitigation steps they provide.
Where can I find more information about CVE-2020-26559?
You can find more information about CVE-2020-26559 at the following references: [CERT VULS ID 799380](https://kb.cert.org/vuls/id/799380) and [Bluetooth Security - Reporting Security](https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/).