CVE-2020-26556

Mesh Provisioning in the Bluetooth Mesh profile 1.0 and 1.0.1 may permit a nearby device, able to conduct a successful brute-force attack on an insufficiently random AuthValue before the provisioning procedure times out, to complete authentication by leveraging Malleable Commitment.

Weakness

The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks.

Affected Software

Potential Mitigations

• Common protection mechanisms include:

• Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.

• Consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator. [REF-45]

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/16.html
• https://cwe.mitre.org/data/definitions/49.html
• https://cwe.mitre.org/data/definitions/560.html
• https://cwe.mitre.org/data/definitions/565.html
• https://cwe.mitre.org/data/definitions/600.html
• https://cwe.mitre.org/data/definitions/652.html
• https://cwe.mitre.org/data/definitions/653.html

References

• https://kb.cert.org/vuls/id/799380
• https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/
• https://www.kb.cert.org/vuls/id/799380