OpenBSD: Local privilege escalation via S/Key and YubiKey.

OpenBSD, in a non-default configuration where S/Key or YubiKey authentication is enabled, allows local users to become root by leveraging membership in the auth group. This occurs because root’s file can be written to /etc/skey or /var/db/yubikey, and need not be owned by root.

https://allelesecurity.com/asa-2019-00653/

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