CVE-2019-8709 in iOS
Summary
by MITRE • 10/28/2020
A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Catalina 10.15, tvOS 13, macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006, watchOS 6, iOS 13. An application may be able to execute arbitrary code with kernel privileges.
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Analysis
by VulDB Data Team • 11/28/2020
The vulnerability identified as CVE-2019-8709 represents a critical memory corruption flaw that existed within Apple's operating system frameworks, specifically affecting the kernel-level state management mechanisms. This issue was particularly concerning because it provided a pathway for malicious applications to escalate privileges and execute arbitrary code with the highest level of system access. The vulnerability stemmed from inadequate handling of kernel state transitions, creating conditions where memory corruption could occur during normal system operations. Security researchers identified that the flaw allowed for potential exploitation through carefully crafted application code that could manipulate kernel memory structures in ways that were not properly validated or restricted. The memory corruption aspect of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which addresses out-of-bounds read vulnerabilities that can lead to memory corruption.
The operational impact of CVE-2019-8709 extends far beyond typical application-level security concerns, as it directly compromised the fundamental security model of Apple's operating systems. When exploited successfully, this vulnerability enabled attackers to gain kernel-level privileges, which essentially provided them with complete control over affected systems. The affected platforms included macOS Catalina 10.15 and subsequent versions, tvOS 13, watchOS 6, and iOS 13, representing a broad attack surface across Apple's ecosystem. The exploitation of this vulnerability through the ATT&CK framework would fall under privilege escalation techniques, specifically targeting the kernel to achieve system-level compromise. This type of vulnerability is particularly dangerous because it bypasses traditional user-mode security controls and operates at the most privileged level of the operating system, making it extremely difficult to detect and mitigate once exploited.
Apple's response to CVE-2019-8709 involved comprehensive security updates that addressed the underlying state management issues within the kernel frameworks. The patches released as part of macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006 implemented improved memory management protocols and enhanced validation checks for kernel state transitions. These updates specifically targeted the conditions that allowed for the memory corruption to occur, ensuring that kernel memory structures remained properly bounded and that state changes were appropriately validated before execution. The remediation approach followed industry best practices for kernel security, incorporating defensive programming techniques and memory safety mechanisms that prevent the types of conditions that could lead to arbitrary code execution. Organizations and users were strongly advised to apply these security updates immediately, as the vulnerability represented a significant risk to system integrity and data confidentiality. The resolution of CVE-2019-8709 demonstrates Apple's commitment to maintaining kernel-level security through proactive patch management and continuous improvement of their security frameworks.