Affected: OpenSSL, Siemens Calibre ICE, Siemens Mcenter, Siemens SCALANCE X204RNA (HSR), Siemens SCALANCE X204RNA (PRP), Siemens SCALANCE X204RNA EEC (HSR), Siemens SCALANCE X204RNA EEC (PRP), Siemens SCALANCE X204RNA EEC (PRP/HSR), Siemens SICAM GridPass, Siemens SIMATIC RTLS Locating Manager

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 `.' 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.