CVE-2018-4423 in macOS
Summary
by MITRE
A logic issue was addressed with improved validation. This issue affected versions prior to macOS Mojave 10.14.1.
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Analysis
by VulDB Data Team • 04/08/2020
The vulnerability identified as CVE-2018-4423 represents a logic flaw within Apple's macOS operating system that was remediated through enhanced input validation mechanisms. This issue specifically impacted systems running versions prior to macOS Mojave 10.14.1, where the insufficient validation allowed for potential exploitation of underlying system processes. The vulnerability falls under the broader category of logic flaws that can compromise system integrity and security posture, often serving as entry points for more sophisticated attacks. The affected versions contained a design flaw in how the operating system handled certain validation checks, creating opportunities for malicious actors to manipulate system behavior through carefully crafted inputs. This type of vulnerability is particularly concerning because it operates at the system level and can potentially enable privilege escalation or unauthorized access to protected resources.
The technical nature of CVE-2018-4423 stems from inadequate validation procedures within macOS core components, particularly affecting how the system processes and evaluates user inputs or system calls. When examining the underlying architecture, this vulnerability demonstrates characteristics consistent with CWE-252, which addresses "Unchecked Return Value" and represents a common class of logic errors where the system fails to properly validate or verify the results of operations before proceeding. The flaw likely existed in kernel-level functions or system APIs that handle authentication, authorization, or resource management processes. Attackers could potentially exploit this condition by providing malformed inputs that would bypass intended validation checks, leading to unexpected system behavior. The vulnerability's impact extends beyond simple input validation as it represents a fundamental breakdown in the system's ability to maintain consistent security boundaries and validate trust relationships.
From an operational perspective, CVE-2018-4423 posed significant risks to macOS environments, particularly in enterprise settings where system integrity and user access controls are paramount. The vulnerability could enable attackers to gain unauthorized access to system resources, potentially leading to data breaches, privilege escalation, or complete system compromise. Organizations running affected versions of macOS were exposed to potential exploitation through various attack vectors including malicious software installation, unauthorized system modifications, or privilege elevation attempts. The remediation process required immediate deployment of macOS Mojave 10.14.1 updates, which introduced improved validation mechanisms and addressed the underlying logic flaw. Security professionals needed to prioritize this patch deployment across their fleets of macOS devices, as the vulnerability could be exploited without user interaction and potentially remained undetected for extended periods.
Mitigation strategies for CVE-2018-4423 centered on immediate patch deployment and system hardening measures. Organizations should have implemented comprehensive patch management procedures to ensure all affected macOS systems received the 10.14.1 update promptly. The remediation process involved not only applying the security update but also conducting thorough vulnerability assessments to identify any potential exploitation that may have occurred before the patch was deployed. System administrators needed to monitor for unusual system behavior or unauthorized access attempts that could indicate exploitation of the vulnerability. Additional security controls including network monitoring, access logging, and behavioral analysis tools helped detect anomalous activities that might indicate successful exploitation. The vulnerability's resolution through improved validation mechanisms aligns with ATT&CK framework techniques related to privilege escalation and defense evasion, where the logic flaw could have been leveraged to bypass security controls and maintain persistence within affected systems. Organizations implementing layered security approaches would have been better positioned to detect and respond to potential exploitation attempts while ensuring their macOS environments remained protected against similar logic-based vulnerabilities.