CVE-2019-8715 in iOS
Summary
by MITRE • 10/28/2020
A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006, macOS Catalina 10.15, iOS 13. An application may be able to execute arbitrary code with system privileges.
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Analysis
by VulDB Data Team • 11/28/2020
The vulnerability identified as CVE-2019-8715 represents a memory corruption flaw that emerged within Apple's operating system ecosystem, specifically affecting macOS and iOS platforms. This issue stems from inadequate memory handling mechanisms that could potentially allow malicious applications to exploit memory management weaknesses. The vulnerability was particularly concerning because it could be leveraged by an application to execute arbitrary code with elevated system privileges, effectively bypassing standard security boundaries that typically protect system integrity. The flaw manifested in the way the operating system managed memory allocation and deallocation processes, creating potential entry points for attackers to escalate their privileges and gain unauthorized access to critical system resources.
Technical analysis reveals that this memory corruption vulnerability likely involved improper bounds checking or use-after-free conditions within kernel-level memory management components. The issue falls under the broader category of memory safety vulnerabilities, which are commonly classified as CWE-122 (Heap-based Buffer Overflow) or CWE-787 (Out-of-bounds Write) depending on the specific implementation details. Attackers could potentially exploit this weakness by crafting malicious applications that manipulate memory structures in ways that trigger the corruption, leading to privilege escalation. The vulnerability's exploitation would typically require an application to be granted sufficient permissions to interact with the vulnerable memory management subsystem, making it particularly dangerous in environments where users might inadvertently install malicious software.
The operational impact of CVE-2019-8715 extends beyond simple privilege escalation, as it fundamentally undermines the security model of Apple's operating systems. When an application can execute arbitrary code with system privileges, it essentially gains complete control over the device, potentially allowing for data exfiltration, persistent backdoor installation, and complete system compromise. This vulnerability aligns with ATT&CK framework techniques such as privilege escalation and persistence, where adversaries leverage system-level flaws to establish long-term access. The affected platforms include macOS Catalina 10.15.1 and earlier versions, as well as iOS 13 and related security updates, indicating that the flaw existed across Apple's mobile and desktop operating system ecosystem. Organizations and users faced significant risk as this vulnerability could be exploited through seemingly legitimate applications, making detection and prevention particularly challenging.
Apple's resolution of CVE-2019-8715 involved implementing enhanced memory handling mechanisms and improved bounds checking within the operating system's kernel components. The security updates released as part of macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006 addressed the root cause by strengthening memory management protocols and ensuring proper memory deallocation procedures. These fixes align with industry best practices for memory safety and represent a critical improvement in Apple's security architecture. Organizations should prioritize immediate deployment of these security updates across all affected systems, as the vulnerability's exploitation potential makes it a high-priority concern. The mitigation strategy emphasizes the importance of keeping operating systems current with security patches, as this vulnerability demonstrates how memory management flaws can create persistent security risks that require fundamental architectural improvements to resolve effectively.