CVE-2018-4308 in macOS
Summary
by MITRE
An out-of-bounds read was addressed with improved bounds checking. This issue affected versions prior to macOS Mojave 10.14.
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Analysis
by VulDB Data Team • 04/08/2020
The vulnerability identified as CVE-2018-4308 represents a critical out-of-bounds read flaw that existed in macOS versions prior to the release of macOS Mojave 10.14. This type of vulnerability falls under the category of memory safety issues that can potentially allow attackers to execute arbitrary code or cause system instability. The flaw was specifically addressed through enhanced bounds checking mechanisms within the operating system's kernel components. The issue demonstrates how seemingly minor programming errors in memory management can create significant security risks for operating systems. Such vulnerabilities are particularly dangerous because they can be exploited to bypass security controls and gain unauthorized access to system resources.
The technical implementation of this vulnerability stems from inadequate input validation and memory boundary checking within macOS kernel extensions or system services. When processing certain data structures or user inputs, the affected code failed to properly validate array indices or buffer limits before accessing memory locations. This out-of-bounds memory access pattern creates opportunities for attackers to manipulate memory contents or extract sensitive information from system memory. The vulnerability's classification aligns with CWE-129, which specifically addresses insufficient checking of buffer limits, and CWE-131, which covers incorrect calculation of buffer size. These weaknesses in input validation and memory management represent fundamental flaws that can be exploited through various attack vectors including privilege escalation and information disclosure.
The operational impact of CVE-2018-4308 extends beyond simple system instability to encompass potential security breaches and unauthorized system access. Systems running affected macOS versions were vulnerable to attackers who could leverage this flaw to execute malicious code with elevated privileges, potentially compromising the entire system. The vulnerability's exploitation could result in data theft, system compromise, or denial of service conditions that would affect both individual users and enterprise environments. Organizations relying on older macOS versions faced significant risk exposure, particularly in environments where system integrity and data protection were paramount. The issue's presence in kernel-level components meant that successful exploitation could bypass traditional user-mode security controls and provide attackers with direct access to core system functionalities.
Mitigation strategies for CVE-2018-4308 primarily focused on upgrading to macOS Mojave 10.14 or later versions where Apple had implemented the necessary bounds checking improvements. System administrators were advised to deploy the official security patches and updates provided by Apple to address the vulnerability. Additionally, organizations should implement comprehensive patch management procedures to ensure all systems receive timely security updates. The remediation process involved not only applying the operating system patches but also monitoring systems for potential exploitation attempts and conducting security audits to verify the effectiveness of the fixes. Security teams were encouraged to review system logs and network traffic for signs of exploitation attempts, particularly focusing on unusual memory access patterns or privilege escalation activities that might indicate exploitation of similar vulnerabilities. The vulnerability highlighted the importance of maintaining up-to-date operating system versions and implementing robust security practices to prevent exploitation of known security flaws.