CVE-2018-4394 in macOS
Summary
by MITRE
A memory corruption issue was addressed with improved input validation. This issue affected versions prior to iOS 12.1, macOS Mojave 10.14.1, tvOS 12.1, watchOS 5.1, iTunes 12.9.1.
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Analysis
by VulDB Data Team • 04/08/2020
The vulnerability identified as CVE-2018-4394 represents a memory corruption flaw that existed in Apple's operating systems and software products prior to specific version updates. This issue stems from inadequate input validation mechanisms within the affected systems, creating potential entry points for malicious actors to exploit memory handling procedures. The vulnerability affects a broad range of Apple's ecosystem including mobile, desktop, and embedded operating systems, demonstrating the widespread nature of the memory corruption risk. Security researchers identified that the flaw allowed for improper memory management when processing certain inputs, potentially leading to arbitrary code execution or system instability.
The technical implementation of this vulnerability aligns with common memory corruption patterns that fall under CWE-121, which addresses stack buffer overflow conditions, and CWE-122, which covers heap buffer overflow scenarios. These classifications indicate that the flaw involves improper handling of memory allocation and deallocation processes, particularly when validating user-supplied data or network inputs. The vulnerability operates at the kernel level in many affected systems, making it particularly dangerous as it can bypass standard user-space protections and potentially escalate privileges to system-level access. Attackers could leverage this flaw by crafting malicious inputs that trigger the memory corruption during processing, leading to unpredictable system behavior.
The operational impact of CVE-2018-4394 extends beyond simple system crashes or instability, as it creates opportunities for sophisticated attack vectors that align with ATT&CK framework techniques such as T1059 for command and scripting interpreter usage and T1068 for exploit for privilege escalation. The vulnerability's presence in iTunes 12.9.1, along with the mobile and desktop operating systems, creates multiple attack surfaces for threat actors. Organizations using affected versions face potential risks including unauthorized system access, data exfiltration, and persistent backdoor establishment. The widespread nature of the affected products means that organizations must assess their entire infrastructure for exposure, including legacy systems that may still rely on older versions of Apple software.
Mitigation strategies for CVE-2018-4394 primarily involve immediate deployment of Apple's security updates, specifically iOS 12.1, macOS Mojave 10.14.1, tvOS 12.1, watchOS 5.1, and iTunes 12.9.1. System administrators should prioritize patch management processes to ensure all affected devices receive the necessary security updates. Additional protective measures include network segmentation to limit potential attack vectors, implementing robust input validation at application layers, and monitoring for unusual system behavior that might indicate exploitation attempts. Security teams should also consider deploying endpoint detection and response solutions to identify potential exploitation attempts and maintain detailed logs of system activities for forensic analysis. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches across all enterprise systems, particularly those running Apple operating systems.