Authentication Bypass Vulnerability in Android 6.0 with Root and Physical Access

CVE-2016-10398 · HIGH Severity

AV:L/AC:L/AU:N/C:C/I:C/A:C

Android 6.0 has an authentication bypass for attackers with root and physical access. Cryptographic authentication tokens (AuthTokens) used by the Trusted Execution Environment (TEE) are protected by a weak challenge. This allows adversaries to replay previously captured responses and use the TEE without authenticating. All apps using authentication-gated cryptography are vulnerable to this attack, which was confirmed on the LG Nexus 5X.

Learn more about our Physical Security Assessment.