CVE-2023-38604 in macOS
Summary
by MITRE • 07/28/2023
An out-of-bounds write issue was addressed with improved input validation. This issue is fixed in watchOS 9.6, macOS Big Sur 11.7.9, iOS 15.7.8 and iPadOS 15.7.8, macOS Monterey 12.6.8, tvOS 16.6, iOS 16.6 and iPadOS 16.6, 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 • 08/20/2023
This vulnerability represents a critical out-of-bounds write flaw that exists within Apple's operating systems, specifically affecting multiple platform versions including watchOS, macOS, iOS, and tvOS. The issue stems from insufficient input validation mechanisms that fail to properly sanitize or verify data boundaries before processing. According to industry standards and vulnerability classification systems, this vulnerability maps to CWE-787 Out-of-bounds Write which is categorized as a severe memory corruption vulnerability. The flaw allows for arbitrary code execution with kernel privileges, indicating that an attacker could potentially escalate their privileges from user-level to system-level access, compromising the entire operating system's integrity and security posture.
The technical nature of this vulnerability suggests that malicious applications or code could exploit memory boundaries within the system's kernel or system libraries. When input data is processed without proper boundary checks, the system may write data beyond allocated memory regions, potentially overwriting critical system structures or executable code. This type of vulnerability is particularly dangerous because it can be leveraged to execute arbitrary code with the highest privileges available to the operating system, effectively bypassing standard security controls and access restrictions. The exploitation could occur through various attack vectors including malicious applications, compromised software installations, or potentially even through network-based attacks if the vulnerable component is accessible over network interfaces.
The operational impact of this vulnerability extends far beyond simple data corruption or application crashes. System administrators and security professionals must consider that successful exploitation could lead to complete system compromise, data exfiltration, persistent backdoor installation, and potential lateral movement within network environments. The vulnerability affects multiple Apple platforms, increasing its attack surface and making it particularly concerning for organizations that deploy Apple devices across their infrastructure. The fact that the fix is available across various operating system versions indicates Apple's recognition of the severity and widespread nature of the issue. Organizations should prioritize patch management and ensure all affected devices are updated promptly to prevent exploitation, as the vulnerability provides a direct path to kernel-level privilege escalation that could be exploited by sophisticated threat actors.
The mitigation strategy involves immediate deployment of the patched versions mentioned in the advisory, which include watchOS 9.6, macOS Big Sur 11.7.9, iOS 15.7.8, iPadOS 15.7.8, macOS Monterey 12.6.8, tvOS 16.6, iOS 16.6, and iPadOS 16.6, and macOS Ventura 13.5. Security teams should also implement additional monitoring for suspicious activities that might indicate exploitation attempts, such as unusual process behavior, unexpected network connections, or unauthorized privilege escalation events. The vulnerability's classification under ATT&CK technique T1068 for exploit for privilege escalation further emphasizes the need for comprehensive monitoring and response procedures. Organizations should also consider implementing application whitelisting policies and restricting the installation of unauthorized applications to reduce the attack surface available to potential exploiters.