CVE-2016-4697 in macOS
Summary
by MITRE
Apple HSSPI Support in Apple OS X before 10.12 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
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Analysis
by VulDB Data Team • 09/20/2022
The vulnerability identified as CVE-2016-4697 resides within the Apple HSSPI (Hardware Security SPI) support implementation in Apple OS X operating systems prior to version 10.12. This flaw represents a critical security weakness that affects the underlying hardware security infrastructure of Apple devices, specifically targeting the interface between hardware security components and the operating system kernel. The vulnerability stems from insufficient input validation and memory management practices within the HSSPI subsystem, which handles communication with hardware security modules and cryptographic processors. This represents a classic example of a buffer overflow or memory corruption vulnerability that can be exploited through malicious software manipulation.
The technical exploitation of this vulnerability occurs when a crafted application attempts to interact with the HSSPI subsystem through improper parameter handling or malformed data structures. Attackers can leverage this weakness to execute arbitrary code with elevated privileges, effectively bypassing standard security boundaries that normally protect the operating system kernel from user-space applications. The memory corruption aspect of this vulnerability can lead to system instability, crashes, or complete system compromise depending on the execution context. The flaw demonstrates poor adherence to secure coding practices and highlights the importance of proper bounds checking and memory management in kernel-level components. This vulnerability directly maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read vulnerabilities that can lead to privilege escalation.
From an operational impact perspective, this vulnerability presents a significant threat to Apple device security as it allows attackers to gain elevated privileges without requiring user interaction or authentication. The attack surface is particularly concerning because it operates within the trusted hardware security subsystem, making it difficult to detect and mitigate through standard security measures. Successful exploitation can result in complete system compromise, data theft, persistent backdoor installation, or denial of service conditions that can render devices unusable. The vulnerability affects all versions of OS X prior to 10.12, representing a substantial attack surface across multiple generations of Apple hardware. Organizations using affected systems face potential exposure to sophisticated attacks that can bypass traditional security controls, making this vulnerability particularly dangerous in enterprise environments where Apple devices are commonly deployed.
The mitigation strategies for CVE-2016-4697 primarily involve immediate system updates to OS X version 10.12 or later, which contain patches addressing the underlying memory corruption issues in the HSSPI subsystem. System administrators should prioritize deployment of these security updates across all affected devices and implement comprehensive monitoring to detect potential exploitation attempts. Additional defensive measures include network segmentation to limit lateral movement, implementation of application whitelisting policies, and enhanced endpoint detection capabilities that can identify suspicious behavior patterns associated with privilege escalation attempts. The vulnerability also underscores the importance of maintaining up-to-date security patches and implementing robust vulnerability management processes. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be leveraged as part of broader attack chains that may include initial access, persistence, and lateral movement phases. Organizations should conduct thorough risk assessments to determine the potential impact on their specific environments and implement layered security controls to minimize exposure to this and similar vulnerabilities.