CVE-2019-8748 in macOS
Summary
by MITRE
A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Catalina 10.15. An application may be able to execute arbitrary code with kernel privileges.
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Analysis
by VulDB Data Team • 03/15/2024
This vulnerability represents a critical memory corruption flaw that existed in Apple's operating system implementation prior to macOS Catalina 10.15. The issue stems from insufficient memory handling mechanisms that could allow malicious applications to exploit memory management weaknesses. The vulnerability falls under the category of kernel-level privilege escalation, where a regular user application could potentially gain unauthorized access to kernel privileges through improper memory allocation or deallocation processes.
The technical nature of this flaw involves memory corruption that occurs when applications interact with kernel memory spaces through improper buffer handling or memory management routines. Such vulnerabilities typically arise when developers fail to properly validate memory boundaries or when memory allocation functions do not adequately protect against overflows or underflows. The weakness creates an opportunity for attackers to manipulate memory contents in ways that bypass normal security restrictions and elevate their privileges to kernel level access.
From an operational perspective, this vulnerability poses significant risk to macOS systems as it allows for arbitrary code execution with the highest system privileges. Attackers could leverage this flaw to install malicious software, modify critical system files, or establish persistent backdoors without requiring user interaction or elevated privileges initially. The impact extends beyond individual system compromise to potential network-wide exploitation if attackers can use the kernel-level access to move laterally within networks or access sensitive data repositories.
The fix implemented in macOS Catalina 10.15 addresses this issue through enhanced memory management protocols and improved validation mechanisms. Apple's security updates typically involve modifications to kernel memory allocation routines, additional bounds checking, and strengthened memory protection mechanisms. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and potentially CWE-122, which covers heap-based buffer overflow scenarios. The remediation approach follows established security practices for preventing memory corruption vulnerabilities in operating system kernels.
Organizations should prioritize updating to macOS Catalina 10.15 or later versions to mitigate this risk, as the vulnerability could be exploited through various attack vectors including malicious applications, web browsers, or other software that interacts with system memory. The exploitability of such kernel-level vulnerabilities often depends on the specific system configuration and the presence of additional attack surface elements, making proactive patch management essential for maintaining system integrity and preventing potential compromise.
This vulnerability demonstrates the critical importance of robust memory management in operating system security and aligns with ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation'. The remediation process also reflects standard security practices for addressing memory corruption issues and emphasizes the need for continuous security updates to protect against evolving threat landscapes. System administrators should monitor for similar vulnerabilities in other operating system components and maintain comprehensive patch management procedures to ensure all system components remain protected against known security flaws.