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Security
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* Fixed an issue in TLS 1.3 server handling of the second ClientHello, after
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sending a HelloRetryRequest message. A man-in-the-middle attacker could
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force a TLS 1.3 session resumption using a ticket to fall back to an
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unintended TLS 1.2 session resumption with an all-zero master secret.
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This could result in client authentication being bypassed and allow client
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impersonation.
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Found and reported by Jaehun Lee, Pohang University of Science and
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Technology (POSTECH).
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