PHP OpenSSL PKCS1 PrivateDecrypt Vulnerable to Marvin Attack before 8.1.29
CVE-2024-2408 Published on June 9, 2024
PHP is vulnerable to the Marvin Attack
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.
Vulnerability Analysis
CVE-2024-2408 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2024-2408. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is a Side Channel Attack Vulnerability?
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not. Discrepancies can take many forms, and variations may be detectable in timing, control flow, communications such as replies or requests, or general behavior. These discrepancies can reveal information about the product's operation or internal state to an unauthorized actor. In some cases, discrepancies can be used by attackers to form a side channel.
CVE-2024-2408 has been classified to as a Side Channel Attack vulnerability or weakness.
Products Associated with CVE-2024-2408
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Affected Versions
PHP Group PHP:- Version 8.1.* and below 8.1.29 is affected.
- Version 8.2.* and below 8.2.20 is affected.
- Version 8.3.* and below 8.3.8 is affected.
- Version 8.1.0 and below 8.1.29 is affected.
- Version 8.2.0 and below 8.2.20 is affected.
- Version 8.3.0 and below 8.3.8 is affected.
- Version 40 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.