CVE-2024-2408

Published: 9 June 2024

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 versions 8.1.29, 8.2.20 and 8.3.8 and above include OpenSSL patches that fix the vulnerability.

Notes

The OpenSSL commit was backported to Ubuntu packages in the
following USN: https://ubuntu.com/security/notices/USN-6663-1
As such, I am marking this CVE as not-affected for the releases
that have the updated OpenSSL package.

Fix additionally backported via USNs 6663-2 and 6663-3,
updating respective releases as not-affected.

Status

Severity score breakdown

References

• https://www.cve.org/CVERecord?id=CVE-2024-2408
• https://github.com/php/php-src/security/advisories/GHSA-hh26-4ppw-5864
• https://ubuntu.com/security/notices/USN-6663-1
• https://ubuntu.com/security/notices/USN-6663-2
• https://ubuntu.com/security/notices/USN-6663-3
• NVD
• Launchpad
• Debian