CVE-2018-4234 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. macOS before 10.13.5 is affected. The issue involves the "IOHIDFamily" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
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Analysis
by VulDB Data Team • 03/20/2023
The vulnerability identified as CVE-2018-4234 resides within Apple's IOHIDFamily component, a critical kernel extension responsible for handling human interface device interactions on macOS systems. This flaw affects macOS versions prior to 10.13.5 and represents a significant security weakness that could be exploited by malicious actors to gain elevated privileges or disrupt system operations. The IOHIDFamily serves as a foundational element for keyboard, mouse, and other input device management, making it a prime target for attackers seeking to establish persistent control over affected systems.
The technical nature of this vulnerability stems from improper input validation within the IOHIDFamily kernel extension, creating a memory corruption flaw that can be triggered through maliciously crafted applications. When a specially designed app is executed on an affected system, it can manipulate the kernel's memory management routines to execute arbitrary code with kernel-level privileges. This type of vulnerability falls under the CWE-121 category of "Stack-based Buffer Overflow" and represents a classic privilege escalation vector that leverages kernel-mode execution contexts. The flaw essentially allows attackers to bypass traditional security boundaries that separate user-space applications from the privileged kernel environment, creating a direct pathway for malicious code execution.
The operational impact of CVE-2018-4234 extends beyond simple privilege escalation, as it provides attackers with the capability to cause system instability through memory corruption or establish persistent backdoors for long-term access. Systems running affected macOS versions become vulnerable to sophisticated attacks where adversaries can manipulate input device drivers to gain root-level access, potentially leading to complete system compromise. This vulnerability aligns with ATT&CK technique T1068 which describes "Exploitation for Privilege Escalation" and demonstrates how kernel-level flaws can be exploited to bypass security controls that normally protect against such attacks. Organizations relying on macOS for critical operations face significant risk exposure, particularly in environments where privileged access is required for system administration or sensitive data processing.
Mitigation strategies for this vulnerability primarily focus on immediate system updates to macOS 10.13.5 or later versions where Apple has patched the underlying memory corruption issue within IOHIDFamily. Security administrators should prioritize deployment of the official macOS security update that addresses this specific kernel extension flaw. Additionally, implementing network monitoring to detect suspicious application execution patterns and maintaining robust endpoint detection capabilities can help identify potential exploitation attempts. The vulnerability highlights the importance of keeping kernel components updated and demonstrates how seemingly minor driver flaws can create substantial security risks. Organizations should also consider implementing application whitelisting policies to prevent execution of untrusted applications that might attempt to exploit this or similar kernel vulnerabilities. This case exemplifies the critical need for comprehensive patch management programs and continuous security monitoring to protect against zero-day exploits targeting foundational operating system components.