OpenSSL Buffer Copy without Checking Size of Input (Classic Buffer Overflow) Vulnerability - CVE-2022-3786

A buffer overrun can be triggered in X.509 certificate verification specifically in name constraint checking. Note that this occurs after certificate chain signature verification and requires either a CA to have signed a malicious certificate or for an application to continue certificate verification despite failure to construct a path to a trusted issuer. An attacker can craft a malicious email address in a certificate to overflow an arbitrary number of bytes containing the .39 character (decimal 46) on the stack. This buffer overflow could result in a crash (causing a denial of service). In a TLS client this can be triggered by connecting to a malicious server. In a TLS server this can be triggered if the server requests client authentication and a malicious client connects.