YubiKeys have an unfixable security flaw — but it’s difficult to exploit

Security researchers have detected a vulnerability in YubiKey two-factor authentication tokens that enables attackers to clone the device according to a new security advisory. The vulnerability was discovered within the Infineon cryptographic library used by most YubiKey products, including the YubiKey 5, Yubikey Bio, Security Key, and YubiHSM 2 series devices.

YubiKey manufacturer...