PHP Observable Discrepancy Vulnerability - CVE-2024-2408

The openssl_private_decrypt function in PHP when using PKCS1 padding (OPENSSL_PKCS1_PADDING which is the default) is vulnerable to the Marvin Attack unless it is used with an OpenSSL version that includes the changes from this pull request: https://github.com/openssl/openssl/pull/13817 (rsa_pkcs1_implicit_rejection). These changes are part of OpenSSL 3.2 and have also been backported to stable versions of various Linux distributions as well as to the PHP builds provided for Windows since the previous release. All distributors and builders should ensure that this version is used to prevent PHP from being vulnerable. PHP Windows builds for the versions8.1.298.2.20 and8.3.8 and above include OpenSSL patches that fix the vulnerability.