Bypassing Entra ID Conditional Access - A Deep Dive Into Device Authentication Mechanisms

Dive deep into the internal workings of device authentication in Entra ID Conditional Access through this conference talk. Explore how attackers can potentially bypass device authentication without administrator privileges by interacting with device certificates and session keys protected by TPM. Learn about the discovered attack implemented through reverse-engineering Microsoft authentication library, which currently has no fix. Walk through the details of the device authentication flow, attack mechanisms for bypassing Conditional Access, and gain insights into defending against and detecting such attacks. Understand the implications for securing Microsoft cloud infrastructure and the challenges in applying appropriate access controls.