CVE-2018-4268 in macOS
Summary
by MITRE
A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to macOS High Sierra 10.13.6.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 03/01/2020
The vulnerability identified as CVE-2018-4268 represents a memory corruption flaw that existed in Apple's macOS operating system prior to the release of macOS High Sierra 10.13.6. This issue stems from inadequate memory management practices within the system's kernel components, specifically affecting how the operating system handles memory allocation and deallocation processes. The vulnerability was classified under the Common Weakness Enumeration (CWE) category CWE-122, which deals with weaknesses related to improper handling of memory allocation and deallocation. The flaw manifested when the system encountered certain memory operations that could lead to buffer overflows or memory corruption states that compromised system stability and security.
The technical nature of this vulnerability involves improper memory handling mechanisms within the kernel space of macOS, where insufficient bounds checking and validation occurred during memory operations. Attackers could potentially exploit this weakness to cause arbitrary code execution or system crashes by manipulating memory allocation patterns that would trigger the corrupted memory states. The vulnerability was particularly concerning because it resided in kernel-level code where successful exploitation could provide attackers with elevated privileges and complete system compromise. This type of memory corruption vulnerability aligns with ATT&CK technique T1068, which involves the exploitation of legitimate credentials and system privileges to gain unauthorized access to system resources.
The operational impact of CVE-2018-4268 extended beyond simple system instability, as it created potential entry points for malicious actors to establish persistent access to affected systems. Systems running versions prior to macOS High Sierra 10.13.6 were particularly vulnerable because they lacked the memory handling improvements implemented in the subsequent security updates. Organizations using affected macOS versions faced increased risk of unauthorized access, data breaches, and system compromise. The vulnerability demonstrated how memory corruption issues in operating system kernels could provide attackers with the foundation for more sophisticated attacks, including privilege escalation and persistent backdoor establishment. Security professionals noted that the flaw required minimal user interaction to exploit, making it particularly dangerous in enterprise environments where macOS systems were widely deployed.
The mitigation for CVE-2018-4268 involved applying the security update released as part of macOS High Sierra 10.13.6, which included enhanced memory handling procedures and improved bounds checking mechanisms. Apple's patch addressed the root cause by implementing stricter memory allocation validation and ensuring proper deallocation procedures that prevented the memory corruption states. Organizations should have prioritized deployment of this update across all affected systems to prevent potential exploitation. The fix exemplifies best practices in memory management security, including input validation, bounds checking, and proper resource cleanup procedures that align with industry standards for secure coding practices. System administrators were advised to verify patch deployment through automated compliance monitoring tools to ensure complete protection against this vulnerability. The resolution also highlighted the importance of maintaining up-to-date operating system versions and implementing robust patch management processes to prevent exploitation of similar memory corruption vulnerabilities.