Vulnerability identifier: #VU53583

Vulnerability risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-26559

CWE-ID: CWE-254

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Bluetooth Mesh profile
Other software / Other software solutions

Vendor: Bluetooth SIG, Inc.

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the leak of AuthValue in the Mesh Provisioning procedure. A remote attacker on the local network can perform a brute-force attack to identify the AuthValue used given the Provisioner’s public key, and the confirmation number and nonce provided by the provisioning device.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Bluetooth Mesh profile: 1.0 - 1.0.1

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External links
http://kb.cert.org/vuls/id/799380
http://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.