CVE-2023-38616 in macOS
Summary
by MITRE • 09/07/2023
A race condition was addressed with improved state handling. This issue is fixed in macOS Ventura 13.5. An app may be able to execute arbitrary code with kernel privileges.
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Analysis
by VulDB Data Team • 10/02/2023
This vulnerability represents a critical race condition flaw in macOS Ventura 13.5 that could potentially allow malicious applications to escalate privileges and execute arbitrary code with kernel-level permissions. The issue stems from inadequate state handling mechanisms within the operating system's kernel, creating temporal windows where improper synchronization between concurrent processes or threads could lead to unauthorized privilege escalation. The race condition occurs when multiple execution paths attempt to access shared kernel resources simultaneously without proper locking mechanisms, enabling an attacker to manipulate the system state during these vulnerable moments.
The technical exploitation of this vulnerability involves leveraging the timing gaps in kernel operations to inject malicious code or manipulate kernel data structures before proper state validation occurs. Attackers could potentially craft applications that repeatedly trigger the race condition, gradually gaining the necessary privileges to execute code with the highest system permissions. This type of vulnerability falls under the CWE-362 category of "Concurrent Execution using Shared Resource with Improper Synchronization" and aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation." The flaw demonstrates a fundamental weakness in the kernel's concurrency control mechanisms, where proper mutual exclusion protocols were either missing or insufficiently implemented.
The operational impact of CVE-2023-38616 extends beyond simple privilege escalation, as successful exploitation could provide attackers with complete system control and persistence capabilities. Once an attacker achieves kernel-level execution, they can bypass all user-mode security controls, access encrypted data, modify system files, and establish backdoors that persist across reboots. This vulnerability particularly affects systems running macOS Ventura 13.5 and earlier versions, where the improved state handling mechanisms were not yet implemented. The risk is compounded by the fact that legitimate applications could potentially trigger the same race condition paths, making detection and prevention challenging.
Mitigation strategies for this vulnerability center on immediate system updates to macOS Ventura 13.5 or later versions where the race condition has been addressed through enhanced state management and proper synchronization mechanisms. System administrators should implement comprehensive monitoring for unusual kernel activity patterns and privilege escalation attempts. The fix typically involves introducing proper mutex locks, semaphores, or other concurrency control primitives to ensure that shared kernel resources are accessed in a mutually exclusive manner. Organizations should also consider implementing application whitelisting policies to prevent unauthorized applications from running, and maintain regular security assessments to identify potential exploitation attempts. Additional protective measures include enabling system integrity protection, monitoring for suspicious kernel extensions, and maintaining up-to-date security patches for all system components to prevent exploitation chains that might leverage this vulnerability.