CVE-2025-43247 is a permissions-related vulnerability in Apple macOS that allows a malicious application running with root privileges to modify the contents of system files. The root cause is an insufficient restriction on system file modifications, classified under CWE-732 (Incorrect Permission Assignment for Critical Resource). This flaw could be exploited by an attacker who has already gained root-level access to the system, enabling them to alter critical system files, potentially undermining system integrity and security controls. The vulnerability affects macOS versions prior to Sequoia 15.6, Sonoma 14.7.7, and Ventura 13.7.7, where Apple has implemented additional restrictions to address the issue. The CVSS v3.1 base score is 5.5 (medium), reflecting network attack vector, low attack complexity, high privileges required, no user interaction, and impact primarily on integrity with limited confidentiality impact and no availability impact. Although no exploits are currently known in the wild, the vulnerability could facilitate persistence or further privilege abuse if combined with other exploits. The vulnerability highlights the critical importance of strict permission enforcement on system files, especially in environments where root access might be compromised or misused. Organizations should prioritize patching affected systems and review root access controls and monitoring to mitigate potential exploitation.

The primary impact of CVE-2025-43247 is on system integrity, as a malicious app with root privileges can modify system files, potentially leading to unauthorized changes in system behavior, persistence of malware, or disabling of security mechanisms. While confidentiality impact is limited, the ability to alter system files can indirectly affect confidentiality if attackers implant backdoors or tamper with logging and auditing. Availability is not directly affected by this vulnerability. The requirement for root privileges limits the scope of exploitation to scenarios where attackers have already escalated privileges or gained administrative access, making it a post-compromise risk. However, in environments where root access is attainable through other means, this vulnerability can significantly increase the attacker's control and ability to maintain persistence. Organizations relying on macOS for critical operations, especially those with sensitive data or regulatory requirements, could face increased risk of system compromise and data integrity violations if this vulnerability is not addressed promptly.

To mitigate CVE-2025-43247, organizations should immediately apply the patches provided in macOS Sequoia 15.6, Sonoma 14.7.7, and Ventura 13.7.7 or later versions. Beyond patching, organizations should enforce strict access controls and monitoring on root accounts to prevent unauthorized privilege escalation. Implementing multi-factor authentication for administrative access and limiting root access to only essential personnel can reduce risk. Employ system integrity monitoring tools to detect unauthorized changes to critical system files. Regularly audit system logs and use endpoint detection and response (EDR) solutions to identify suspicious activities indicative of privilege misuse. Additionally, consider deploying application whitelisting and restricting the installation of untrusted software to minimize the chance of malicious apps gaining root privileges. Finally, conduct regular security training for administrators on the risks of privilege abuse and best practices for securing macOS environments.