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Re: [webauthn] Clarify how a user can authenticate from multiple devices (#151)

From: Felix Magedanz via GitHub <sysbot+gh@w3.org>
Date: Mon, 27 Jun 2022 13:00:24 +0000
To: public-webauthn@w3.org
Message-ID: <issue_comment.created-1167322924-1656334821-sysbot+gh@w3.org>
> Passkeys fall under the relax of point 3 that @emlun mentioned as they will be synced via iCloud, right? Not sure if this scenario is covered: if I compromise someone's iCloud account and sign in on a new iOS device, wouldn't my faceID unlock passkeys?

Yes – if you compromise someone's iCloud account, manage to sign in on a device under your control, and set up Face ID on that device.

Apple more or less [enforces 2FA](https://support.apple.com/en-ke/guide/security/sec3e341e75d/web) for Keychain access to prevent such an attack on credentials from happening. But there are certainly cases where this threat model is not acceptable, e.g. under certain regulations (in their current form at least).

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