CVE-2018-4132 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. macOS before 10.13.4 is affected. The issue involves the "Intel Graphics Driver" 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 • 02/07/2021
The vulnerability identified as CVE-2018-4132 represents a critical security flaw within Apple's macOS operating system affecting versions prior to 10.13.4. This vulnerability specifically targets the Intel Graphics Driver component which serves as the fundamental interface between the operating system and graphics hardware. The flaw resides in how the graphics driver handles memory management and input validation, creating a pathway for malicious actors to exploit the system's graphics processing capabilities. The vulnerability falls under CWE-121, which describes a stack-based buffer overflow condition, indicating that the memory corruption occurs due to improper handling of data structures within the driver's memory allocation processes.
The technical exploitation of this vulnerability enables attackers to execute arbitrary code with elevated privileges, effectively bypassing standard security boundaries that typically protect the operating system from unauthorized modifications. When a malicious application is launched on an affected system, the Intel Graphics Driver component processes graphics commands that contain crafted payloads designed to trigger the memory corruption. This memory corruption can manifest as heap corruption or stack overflow conditions that allow attackers to overwrite critical memory locations with malicious instructions. The privilege escalation aspect of this vulnerability means that attackers can gain root-level access to the system, potentially enabling them to install malware, modify system files, or establish persistent backdoors.
The operational impact of CVE-2018-4132 extends beyond simple privilege escalation as it provides attackers with a reliable method to compromise macOS systems without requiring user interaction beyond launching the malicious application. This makes the vulnerability particularly dangerous in environments where users may inadvertently download or execute untrusted software. The memory corruption nature of the flaw can also lead to system instability and denial of service conditions, where legitimate applications may crash or the entire system may become unresponsive. Security researchers have noted that the vulnerability can be leveraged in conjunction with other attack vectors, making it a valuable component in advanced persistent threat campaigns. The attack surface is particularly concerning given that graphics drivers are essential components that run continuously in the background, providing persistent access points for attackers.
Organizations and individuals should immediately apply the macOS 10.13.4 update or later versions that contain patches addressing this vulnerability. The mitigation strategy involves not only updating the operating system but also implementing additional security controls such as application whitelisting, monitoring for suspicious graphics-related processes, and maintaining updated antivirus signatures that can detect exploitation attempts. System administrators should also consider implementing network monitoring to detect potential exploitation attempts and establish incident response procedures specific to graphics driver vulnerabilities. The vulnerability demonstrates the importance of maintaining up-to-date system components and highlights the risks associated with graphics driver security, as these components often operate with elevated privileges and handle sensitive data processing tasks that can be leveraged for system compromise. This vulnerability aligns with ATT&CK technique T1055 which covers process injection methods, and T1068 which involves the abuse of elevated privileges gained through system vulnerabilities.