Acceptance of CertificateVerify Message before ClientKeyExchange in TLS 1.2

In wolfSSL 5.8.2 and earlier, a logic flaw existed in the TLS 1.2 server state machine implementation. The server could incorrectly accept the CertificateVerify message before the ClientKeyExchange message had been received. This issue affects wolfSSL before 5.8.4 (wolfSSL 5.8.2 and earlier is vulnerable, 5.8.4 is not vulnerable). In 5.8.4 wolfSSL would detect the issue later in the handshake. 5.9.0 was further hardened to catch the issue earlier in the handshake.

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不恰当实现的标准安全检查

wolfSSL（CyaSSL） 安全漏洞

wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL（CyaSSL） 5.8.4之前版本存在安全漏洞，该漏洞源于TLS 1.2服务器状态机实现存在逻辑缺陷，可能导致服务器在收到ClientKeyExchange消息之前错误地接受CertificateVerify消息。

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