CVE-2022-3786X.509 Email Address Variable Length Buffer Overflow

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• OpenSSL Advisory vendor-advisory
• 3.0.7 git commit patch
• https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00789.html
• https://www.kb.cert.org/vuls/id/794340
• https://cert-portal.siemens.com/productcert/html/ssa-408105.html