CVE-2020-26556 Auth bypass in n/a
A nearby attacker can bypass Bluetooth Mesh provisioning authentication by brute-forcing weak AuthValues due to malleable commitments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-26556?
CVE-2020-26556 is a high-severity authentication bypass vulnerability in n/a, published on 24 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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: CWE-307
Which versions are affected by CVE-2020-26556?
It affects 2 products.
Products include Bluetooth Bluetooth Core Specification, Bluetooth Mesh Profile.
How do I fix CVE-2020-26556?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2020-26556 being exploited?
There is no known exploitation of CVE-2020-26556 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-69j7-838h-x496, ROOT-OS-UBUNTU-2204-CVE-2020-26556, UBUNTU-CVE-2020-26556.