New BrutePrint Attack Lets Attackers Unlock Smartphones with Fingerprint Brute-Force
May 29, 2023
Authentication / Mobile Security
Researchers have discovered an inexpensive attack technique that could be leveraged to brute-force fingerprints on smartphones to bypass user authentication and seize control of the devices. The approach, dubbed BrutePrint , bypasses limits put in place to counter failed biometric authentication attempts by weaponizing two zero-day vulnerabilities in the smartphone fingerprint authentication (SFA) framework. The flaws, Cancel-After-Match-Fail (CAMF) and Match-After-Lock (MAL), leverage logical defects in the authentication framework, which arises due to insufficient protection of fingerprint data on the Serial Peripheral Interface (SPI) of fingerprint sensors. The result is a "hardware approach to do man-in-the-middle (MitM) attacks for fingerprint image hijacking," researchers Yu Chen and Yiling He said in a research paper. "BrutePrint acts as a middleman between fingerprint sensor and TEE [Trusted Execution Environment]." The goal, at its core, is to...