CVE-2024-2408: PHP is vulnerable to the Marvin Attack
First published: Sun Jun 09 2024(Updated: )
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.
Credit: security@php.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PHP | >=8.1.0<8.1.29 | |
| PHP | >=8.2.0<8.2.20 | |
| PHP | >=8.3.0<8.3.8 | |
| Fedora | =40 |
Remedy
Use a recent patched version of OpenSSL.
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Reference Links
- https://github.com/php/php-src/security/advisories/GHSA-hh26-4ppw-5864
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PKGTQUOA2NTZ3RXN22CSAUJPIRUYRB4B/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/W45DBOH56NQDRTOM2DN2LNA2FZIMC3PK/
Frequently Asked Questions
What is the severity of CVE-2024-2408?
CVE-2024-2408 is considered a high-severity vulnerability due to its potential to allow attackers to exploit the Marvin Attack via the openssl_private_decrypt function.
How do I fix CVE-2024-2408?
To fix CVE-2024-2408, update your PHP to a version above 8.1.29, 8.2.20, or 8.3.8 where the vulnerability is patched.
Which versions of PHP are affected by CVE-2024-2408?
CVE-2024-2408 affects PHP versions 8.1.0 to 8.1.29, 8.2.0 to 8.2.20, and 8.3.0 to 8.3.8.
What is the nature of the vulnerability in CVE-2024-2408?
CVE-2024-2408 exposes the openssl_private_decrypt function to the Marvin Attack when using PKCS1 padding.
Is CVE-2024-2408 specific to any operating systems?
CVE-2024-2408 is specifically noted to affect PHP installations on Fedora 40, among others.
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