fix(webauthn): bound and validate getNextAssertion iteration#290
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AlfioEmanueleFresta wants to merge 1 commit into
Open
fix(webauthn): bound and validate getNextAssertion iteration#290AlfioEmanueleFresta wants to merge 1 commit into
AlfioEmanueleFresta wants to merge 1 commit into
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Cap getNextAssertion iteration at the device's stated maxCredentialCountInList so a hostile or buggy numberOfCredentials cannot force an unbounded loop, and reject any assertion whose rpIdHash does not match the requested RP ID.
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The multi-assertion loop trusted the device-reported credential count with no limit, so a misbehaving device could drive unbounded iteration. The loop is now bounded and each returned assertion is checked for consistency with the request. This hardens the client against a hostile authenticator.