CVE-2024-54559 is a vulnerability identified in Apple macOS that allows an application to access sensitive user data due to inadequate access control checks. The root cause is a failure to properly enforce authorization policies, categorized under CWE-284 (Improper Access Control). This flaw enables an app, potentially without elevated privileges, to bypass restrictions and read sensitive information that should otherwise be protected. The vulnerability requires local access and user interaction, such as running or installing the malicious app, but does not require prior authentication or privileges. Apple addressed this issue in macOS Sequoia 15.2 by enhancing the verification and access control mechanisms to prevent unauthorized data access. The CVSS v3.1 base score is 5.5, reflecting a medium severity level, with the vector indicating local attack vector (AV:L), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), high confidentiality impact (C:H), and no impact on integrity or availability (I:N/A:N). There are no known exploits in the wild at this time, but the vulnerability poses a risk of sensitive data leakage if exploited. The lack of integrity and availability impact means the vulnerability primarily threatens confidentiality. The affected versions are unspecified but presumably all versions prior to macOS Sequoia 15.2. This vulnerability is significant for users and organizations relying on macOS devices, especially where sensitive data confidentiality is critical.

The primary impact of CVE-2024-54559 is the unauthorized disclosure of sensitive user data on macOS systems. This can lead to privacy violations, leakage of personal or corporate confidential information, and potential downstream effects such as identity theft, corporate espionage, or compliance violations. Since exploitation requires local access and user interaction, the risk is somewhat mitigated by the need for user involvement, but social engineering or malware delivery could facilitate exploitation. The vulnerability does not affect system integrity or availability, so it does not directly enable system compromise or denial of service. However, the confidentiality breach alone can have serious repercussions for organizations handling sensitive data on macOS devices. Enterprises with macOS endpoints, particularly in sectors like finance, healthcare, and government, could face regulatory and reputational damage if sensitive data is exposed. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits post-disclosure.

To mitigate CVE-2024-54559, organizations and users should promptly update all macOS devices to version Sequoia 15.2 or later, where the vulnerability has been fixed. Beyond patching, organizations should enforce strict application control policies to limit the installation and execution of untrusted or unsigned applications, reducing the risk of malicious apps exploiting this flaw. Employ endpoint detection and response (EDR) solutions capable of monitoring unusual app behavior and data access patterns on macOS. User education is critical to prevent social engineering attacks that might trick users into running malicious apps. Additionally, implement least privilege principles to restrict user permissions and consider using macOS’s built-in privacy controls to limit app access to sensitive data. Regularly audit installed applications and monitor system logs for suspicious activity. For high-security environments, consider network segmentation and device management policies that restrict macOS device usage to trusted applications and users. Finally, maintain up-to-date backups to mitigate any indirect consequences of data exposure.