Local PIN Bypass Vulnerability in Yubico PAM-U2F

CVE-2021-31924

What is CVE-2021-31924?

Yubico's pam-u2f prior to version 1.1.1 contains a logic flaw that may permit attackers to bypass the PIN requirement through specific configurations. This vulnerability arises when pam-u2f is set to require PIN authentication, and attended applications inadvertently permit NULL submissions as the PIN. Successfully exploiting this weakness allows the authentication process to proceed without the necessary PIN, enabling FIDO2 authentication while neglecting the PIN, provided the attacker has physical access to the YubiKey or an equivalent registered authenticator.

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References