CVE-2017-7023 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.3.3 is affected. macOS before 10.12.6 is affected. tvOS before 10.2.2 is affected. watchOS before 3.2.3 is affected. The issue involves the "Kernel" component. It 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 • 01/05/2021
The vulnerability identified as CVE-2017-7023 represents a critical kernel-level flaw affecting multiple Apple operating systems including iOS, macOS, tvOS, and watchOS. This security weakness resides within the kernel component of Apple's software ecosystem, making it particularly dangerous as the kernel serves as the core foundation of operating system functionality and security controls. The vulnerability enables attackers to execute arbitrary code with elevated privileges, effectively bypassing normal security boundaries that typically protect system integrity and user data.
The technical nature of this flaw involves memory corruption that occurs when processing maliciously crafted applications. Attackers can exploit this vulnerability by developing or distributing applications designed to trigger specific memory handling behaviors within the kernel. The vulnerability's classification aligns with CWE-119, which addresses "Improper Access to Memory" and represents a fundamental breakdown in memory safety mechanisms. When exploited, the memory corruption can lead to privilege escalation, allowing unauthorized code execution at the most privileged system level where security controls are normally strongest.
The operational impact of CVE-2017-7023 extends beyond simple code execution, as it can also result in denial of service conditions that may render affected devices unusable. This dual nature makes the vulnerability particularly concerning for enterprise environments and individuals who rely on these devices for critical operations. The affected versions indicate that the vulnerability existed for an extended period, providing ample opportunity for threat actors to develop and deploy exploits. The fact that multiple Apple platforms share this vulnerability demonstrates a systemic issue within Apple's kernel implementation that required patches across their entire product portfolio.
The exploitation of this vulnerability aligns with ATT&CK framework techniques related to privilege escalation and defense evasion. Specifically, it maps to techniques involving kernel exploitation and code injection, where attackers leverage system-level weaknesses to gain persistent access to compromised devices. The vulnerability's impact on kernel components makes it particularly dangerous for mobile and embedded systems where device integrity is paramount. Organizations and individuals should prioritize immediate patching of affected systems, as the window for exploitation was significant given the widespread adoption of affected Apple products. The vulnerability also highlights the importance of kernel security in modern operating systems and the need for continuous security assessment of core system components to prevent similar issues from emerging in the future.