CVE-2020-26556 Explained : Impact and Mitigation

Bluetooth Mesh profile 1.0 and 1.0.1 are vulnerable to a security issue that could allow unauthorized access through a brute-force attack on the authentication process.

Understanding CVE-2020-26556

This CVE involves a vulnerability in the Mesh Provisioning process within the Bluetooth Mesh profile 1.0 and 1.0.1.

What is CVE-2020-26556?

The vulnerability in the Bluetooth Mesh profile 1.0 and 1.0.1 allows a nearby unauthorized device to complete authentication by exploiting a weakness in the AuthValue during the provisioning procedure.

The Impact of CVE-2020-26556

The vulnerability could lead to unauthorized access to the Bluetooth Mesh network, potentially compromising the security and privacy of connected devices.

Technical Details of CVE-2020-26556

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability arises from the insufficient randomness of the AuthValue in the provisioning process, enabling an attacker to conduct a successful brute-force attack and complete authentication using Malleable Commitment.

Affected Systems and Versions

Bluetooth Mesh profile 1.0
Bluetooth Mesh profile 1.0.1

Exploitation Mechanism

Attacker conducts a brute-force attack on the AuthValue during the provisioning process.
Leveraging Malleable Commitment to complete authentication.

Mitigation and Prevention

Protecting systems from CVE-2020-26556 is crucial to maintaining security.

Immediate Steps to Take

Update Bluetooth Mesh devices to the latest firmware version.
Implement strong, random AuthValues to prevent brute-force attacks.
Monitor network activity for any suspicious behavior.

Long-Term Security Practices

Regularly review and update security protocols for Bluetooth Mesh networks.
Conduct security training for users to recognize and report potential security threats.

Patching and Updates

Stay informed about security advisories and patches released by Bluetooth technology providers.