CVE-2024-2408
Description
The RSA decryption implementation using PKCS#1 v1.5 padding in OpenSSL is vulnerable to a timing side-channel attack known as the Marvin Attack. This vulnerability arises because the execution time of the openssl_private_decrypt() function in PHP with OpenSSL varies based on whether a valid message is returned. This flaw allows an attacker to use these timing differences to decrypt captured ciphertexts or forge signatures, compromising the security of the encrypted data.
The vulnerability has been demonstrated through statistical analysis of execution times, confirming the presence of a side channel that can be leveraged in a Bleichenbacher-style attack.
Statement
The severity of this vulnerability is considered Moderate rather than Important due to the specific conditions required for exploitation and the complexity involved in executing the attack. While the timing side-channel can potentially be used to decrypt ciphertexts or forge signatures, it necessitates a high degree of precision and a large number of measurements to discern the timing differences accurately. Additionally, the attack requires the ability to send numerous crafted ciphertexts to the decryption function and accurately measure the response times, which might not be feasible in all environments. Therefore, while the vulnerability poses a real threat, its practical exploitation is significantly constrained by these technical challenges.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.9 | 5.9 | 5.9 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | High | High |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | None | None | None |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality,Other
Technical Impact: Read Application Data; Other
Information exposure.
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