CVE-2024-40843 in macOS
Summary
by MITRE • 09/17/2024
The issue was addressed with improved checks. This issue is fixed in macOS Sequoia 15. An app may be able to modify protected parts of the file system.
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Analysis
by VulDB Data Team • 09/24/2024
The vulnerability identified as CVE-2024-40843 represents a significant security flaw in macOS Sequoia 15 that allows applications to potentially modify protected file system components. This issue stems from inadequate validation mechanisms that should have prevented unauthorized access to critical system directories and files. The flaw exists within the operating system's permission model and file access controls, creating a pathway for malicious or poorly designed applications to bypass normal security boundaries. The vulnerability specifically targets the integrity of protected system areas that should remain immutable to prevent system corruption and maintain operational stability. This type of weakness falls under the category of improper access control as defined by CWE-284, where insufficient privileges are enforced for accessing protected resources.
The technical implementation of this vulnerability demonstrates a failure in the kernel-level file system protection mechanisms that are supposed to enforce mandatory access controls. Applications that normally operate under restricted privileges can exploit this flaw to gain elevated access to protected directories and system files. The issue manifests when the operating system fails to properly validate file access requests from user-space applications against established security policies. This allows for potential privilege escalation scenarios where applications can modify critical system components such as configuration files, system libraries, or protected metadata structures. The fix implemented in macOS Sequoia 15 addresses this by strengthening the validation checks that occur during file system operations, ensuring that all access requests are properly authenticated and authorized before any modifications are permitted.
The operational impact of CVE-2024-40843 extends beyond simple file system corruption, as it creates potential vectors for more sophisticated attacks within the macOS environment. Attackers could leverage this vulnerability to modify system integrity checks, alter security configurations, or implant malicious code within protected areas of the file system. The threat landscape for this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1548.001 tactic for privilege escalation, specifically targeting the modification of protected system files. Organizations running affected macOS versions face increased risk of system compromise, as this vulnerability could enable attackers to establish persistent footholds or degrade system security posture. The potential for cascading effects exists, as modifications to protected system components could trigger system instability or create additional attack vectors for further exploitation.
Mitigation strategies for CVE-2024-40843 should prioritize immediate deployment of the macOS Sequoia 15 update, which contains the necessary patches to address the underlying access control weaknesses. System administrators should conduct comprehensive security assessments to identify any applications that may have previously exploited this vulnerability or that operate with elevated privileges in potentially risky configurations. The implementation of additional monitoring mechanisms around protected file system access patterns can help detect anomalous behavior that may indicate exploitation attempts. Organizations should also review their application deployment policies to ensure that only trusted applications with legitimate system access requirements are granted elevated privileges. Security teams should consider implementing file integrity monitoring solutions that can detect unauthorized modifications to protected system areas, providing additional layers of defense beyond the operating system's built-in protections. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date system configurations and the necessity of robust access control enforcement in modern operating systems.