Description
Nextcloud Twofactor WebAuthn is the WebAuthn Two-Factor Provider for Nextcloud. Prior to 1.4.2 and 2.4.1, a missing ownership check allowed an attack to take-away a 2FA webauthn device when correctly guessing a 80-128 character long random string of letters, numbers and symbols. The victim would then be prompted to register a new device on the next login. The attacker can not authenticate as the victim. This vulnerability is fixed in 1.4.2 and 2.4.1.
Problem types
CWE-639: Authorization Bypass Through User-Controlled Key
Product status
>= 2.0.0-beta.1, < 2.4.1
References
github.com/...sories/security/advisories/GHSA-fr8x-mvjg-wf9q
github.com/nextcloud/twofactor_webauthn/pull/881
github.com/...ommit/5d2302166d31ee2e01b2e21556bd5372156da13d
