TLS 1.3 Vulnerability in wolfSSL Affects Secure Connections

CVE-2021-3336

Summary

In wolfSSL versions prior to 4.7.0, the DoTls13CertificateVerify function in tls13.c fails to properly handle certain anomalous behaviors from peers. Specifically, it does not halt processing when a client sends an ED25519, ED448, ECC, or RSA signature without the corresponding certificate. This oversight exposes the client to potential impersonation attacks by man-in-the-middle attackers targeting TLS 1.3 connections.

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