CVE-2018-4156 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 11.3 is affected. macOS before 10.13.4 is affected. The issue involves the "PluginKit" component. A race condition allows attackers to execute arbitrary code in a privileged context via a crafted app.
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Analysis
by VulDB Data Team • 07/27/2024
The vulnerability identified as CVE-2018-4156 resides within Apple's PluginKit framework, a critical component responsible for managing plugin extensions in iOS and macOS operating systems. This flaw affects versions prior to iOS 11.3 and macOS 10.13.4, representing a significant security weakness that could enable malicious actors to escalate privileges and execute unauthorized code within the system's most protected areas. The vulnerability specifically manifests as a race condition within the PluginKit subsystem, creating a temporal window where system protections can be circumvented through carefully crafted malicious applications.
The technical implementation of this vulnerability exploits a race condition that occurs during the plugin loading process within PluginKit. When a malicious application attempts to load a plugin, the race condition allows attackers to manipulate the system's privilege escalation mechanisms. This flaw operates at the kernel level where the system's security boundaries can be temporarily bypassed, enabling code execution with elevated privileges that would normally be restricted to system processes only. The race condition typically occurs when multiple threads access shared resources without proper synchronization mechanisms, creating opportunities for attackers to insert malicious code into legitimate system processes.
The operational impact of CVE-2018-4156 extends far beyond simple privilege escalation, as it provides attackers with a pathway to execute arbitrary code within the privileged context of the operating system. This capability allows threat actors to bypass standard security controls including code signing requirements, sandbox restrictions, and other kernel-level protections that normally prevent unauthorized system modifications. Attackers could leverage this vulnerability to install persistent backdoors, modify system files, access sensitive user data, or establish covert communication channels that remain undetected by standard security monitoring solutions. The vulnerability essentially undermines the fundamental security model of Apple's operating systems by allowing malicious code to operate with the same privileges as legitimate system components.
Mitigation strategies for CVE-2018-4156 primarily focus on immediate system updates to the patched versions of iOS 11.3 and macOS 10.13.4, which contain the necessary code modifications to eliminate the race condition within PluginKit. Organizations should prioritize deployment of these security patches across all affected devices, particularly in enterprise environments where the risk of exploitation remains high. Additionally, system administrators should implement enhanced monitoring for suspicious plugin loading activities and maintain strict control over application installation processes to prevent unauthorized software from being executed on critical systems. This vulnerability aligns with CWE-362, which specifically addresses race conditions in concurrent programming, and represents a technique that could be categorized under ATT&CK tactic TA0004 (Privilege Escalation) and technique T1068 (Local Privilege Escalation) in the MITRE ATT&CK framework. Security professionals should also consider implementing application whitelisting policies and maintaining comprehensive system integrity monitoring to detect potential exploitation attempts before they can cause significant damage to the affected systems.