CVE-2024-0914 identifies a timing side-channel vulnerability in the opencryptoki package version 3.0.0, specifically during the processing of RSA PKCS#1 v1.5 padded ciphertexts. Opencryptoki is an open-source implementation of the PKCS#11 cryptographic token interface, commonly used in hardware security modules (HSMs) and cryptographic applications. The vulnerability arises because the time taken to process certain RSA ciphertexts varies in a way that leaks information about the private key operations. An attacker can measure these timing discrepancies remotely (network vector) without requiring privileges or user interaction, although the attack complexity is high due to the need for precise timing measurements and controlled ciphertext inputs. Exploiting this side-channel could enable unauthorized decryption of ciphertexts or forging of digital signatures, compromising confidentiality and authenticity. The CVSS vector indicates no impact on integrity or availability, but a high impact on confidentiality. No patches or exploits are currently documented, but the vulnerability is publicly known since January 31, 2024. This flaw affects only version 3.0.0 of opencryptoki, so organizations using this specific version in cryptographic modules are at risk. The vulnerability underscores the importance of constant-time cryptographic implementations to prevent side-channel leakage.

For European organizations, the primary impact is the potential compromise of confidentiality in systems relying on opencryptoki 3.0.0 for RSA cryptographic operations. This is particularly critical for entities using HSMs or cryptographic tokens for secure key management, digital signatures, or encrypted communications. If exploited, attackers could decrypt sensitive data or forge signatures, undermining trust in digital identities and secure communications. This could affect sectors such as finance, government, telecommunications, and critical infrastructure, where cryptographic assurance is essential. The medium severity and high attack complexity reduce the likelihood of widespread exploitation, but targeted attacks against high-value assets remain a concern. The absence of known exploits suggests a window for proactive mitigation. Organizations may face regulatory and compliance risks if sensitive data confidentiality is breached due to this vulnerability.

1. Monitor for and apply security patches or updates from the opencryptoki maintainers as soon as they become available, especially for version 3.0.0 users. 2. If patching is not immediately possible, consider disabling or restricting the use of vulnerable RSA PKCS#1 v1.5 operations in opencryptoki or migrating to alternative cryptographic libraries that implement constant-time operations. 3. Implement network-level controls to limit exposure of cryptographic services using opencryptoki to untrusted networks, reducing the attack surface. 4. Employ side-channel resistant cryptographic practices, including constant-time algorithms and blinding techniques, to mitigate timing attacks. 5. Conduct cryptographic usage audits to identify and isolate vulnerable components. 6. Enhance monitoring and anomaly detection for unusual cryptographic operation patterns that may indicate exploitation attempts. 7. Educate security teams about timing side-channel risks and encourage secure coding and deployment practices for cryptographic modules.