An adversary leverages a firmware weakness within the Thunderbolt protocol, on a computing device to manipulate Thunderbolt controller firmware in order to exploit vulnerabilities in the implementation of authorization and verification schemes within Thunderbolt protection mechanisms. Upon gaining physical access to a target device, the adversary conducts high-level firmware manipulation of the victim Thunderbolt controller SPI (Serial Peripheral Interface) flash, through the use of a SPI Programing device and an external Thunderbolt device, typically as the target device is booting up. If successful, this allows the adversary to modify memory, subvert authentication mechanisms, spoof identities and content, and extract data and memory from the target device. Currently 7 major vulnerabilities exist within Thunderbolt protocol with 9 attack vectors as noted in the Execution Flow.

https://capec.mitre.org/data/definitions/665.html

Related CWE definitions

A product requires authentication, but the product has an alternate path or channel that does not require authentication.
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
The product uses a transmission protocol that does not include a mechanism for verifying the integrity of the data during transmission, such as a checksum.
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
The product initializes or sets a resource with a default that is intended to be changed by the administrator, but the default is not secure.
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