An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing and then an invalid second handshake occurs. The crash happens in the application's error handling path where the gnutls_deinit function is called after detecting a handshake failure.

🗓️ 17 Sep 2020 07:00:00Reported by MicrosoftType

GnuTLS before 3.6.15 allows a TLS 1.3 client NULL pointer dereference after no renegotiation timing and an invalid second handshake, causing deinit crash.

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