CVE-2023-42910 is a security vulnerability identified in Apple macOS, stemming from multiple memory corruption issues caused by inadequate input validation when processing specially crafted files. These memory corruption flaws can lead to unexpected application crashes or, more critically, arbitrary code execution, allowing an attacker to run malicious code with the privileges of the affected application or user. The vulnerability affects macOS versions prior to the release of macOS Sonoma 14.2, where Apple has implemented fixes to improve input validation and address these memory corruption problems. The exact affected versions are unspecified, but the issue was reserved in September 2023 and published in December 2023. No public exploits have been observed in the wild, indicating that exploitation may require crafted files delivered through vectors such as email attachments, downloads, or network shares. The lack of a CVSS score necessitates an independent severity assessment. Given that arbitrary code execution can compromise system confidentiality, integrity, and availability, and that exploitation does not appear to require user interaction beyond opening or processing a malicious file, the vulnerability represents a significant risk. The patch from Apple should be applied promptly to mitigate potential attacks. Organizations relying on macOS devices, especially those processing untrusted files, should be vigilant and implement additional controls to limit exposure.

For European organizations, the impact of CVE-2023-42910 can be substantial, particularly for sectors with high macOS usage such as creative industries, software development, finance, and government agencies. Successful exploitation could lead to unauthorized access, data breaches, disruption of critical applications, and potential lateral movement within networks. The ability to execute arbitrary code may allow attackers to install persistent malware, exfiltrate sensitive data, or disrupt operations. Since macOS is widely used in certain European countries and industries, the risk extends to intellectual property theft, privacy violations under GDPR, and operational downtime. The absence of known exploits currently reduces immediate risk but also underscores the importance of proactive patching before attackers develop weaponized exploits. Organizations that handle large volumes of external files or collaborate internationally are particularly vulnerable to file-based attacks leveraging this flaw.

1. Immediately update all macOS devices to version 14.2 (Sonoma) or later, where the vulnerability is patched. 2. Implement strict file handling policies, including scanning all incoming files with advanced endpoint protection and sandboxing suspicious files before opening. 3. Restrict the use of macOS devices to trusted networks and limit exposure to untrusted file sources such as unsolicited emails or downloads. 4. Employ application whitelisting and least privilege principles to minimize the impact of potential code execution. 5. Educate users about the risks of opening files from unknown or untrusted sources. 6. Monitor system and application logs for unusual crashes or behaviors that may indicate exploitation attempts. 7. Use network segmentation to isolate macOS systems that process external files from critical infrastructure. 8. Maintain up-to-date backups and incident response plans tailored to macOS environments.