CVE-2021-3450 – CA certificate check bypass with X509_V_FLAG_X509_STRICT

https://notcve.org/view.php?id=CVE-2021-3450

25 Mar 2021 — The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectivel... • http://www.openwall.com/lists/oss-security/2021/03/27/1 • CWE-295: Improper Certificate Validation •