Gentoo: GLSA-202208-11: Yubico pam-u2f: Local PIN Bypass vulnerability
Summary
A logic issue in Yubico pam-u2f could result in the bypass of a PIN entry requirement when authenticating with FIDO2.
Resolution
All Yubico pam-u2f users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-auth/pam_u2f-1.1.1"
References
[ 1 ] CVE-2021-31924 https://nvd.nist.gov/vuln/detail/CVE-2021-31924 [ 2 ] YSA-2021-03
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/202208-11
Concerns
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
Synopsis
A vulnerability has been discovered in pam-u2f which could allow a local attacker to bypass PIN entry.
Background
Yubico pam-u2f is a PAM module for FIDO2 and U2F keys.
Affected Packages
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-auth/pam_u2f < 1.1.1 >= 1.1.1
Impact
===== An attacker with local access to certain applications using pam-u2f for authentication could incorrectly successfully authenticate without entering the authentication PIN.
Workaround
There is no known workaround at this time.