CVE-2018-4456 in macOS
Summary
by MITRE
A memory corruption issue was addressed with improved input validation. This issue affected versions prior to macOS High Sierra 10.13.6, macOS Mojave 10.14.
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Analysis
by VulDB Data Team • 06/10/2020
The vulnerability identified as CVE-2018-4456 represents a memory corruption flaw that existed in Apple's macOS operating system prior to specific version releases. This issue stemmed from inadequate input validation mechanisms within the system's core components, creating potential attack vectors that could be exploited by malicious actors. The vulnerability specifically impacted systems running versions earlier than macOS High Sierra 10.13.6 and macOS Mojave 10.14, indicating that Apple had not yet implemented sufficient safeguards to prevent the memory corruption scenario that could occur during normal system operations.
The technical nature of this memory corruption issue falls under the category of improper input validation, which is classified as CWE-20 by the Common Weakness Enumeration standard. This weakness occurs when software does not properly validate or sanitize input data before processing it, leading to potential memory corruption that can result in system instability, application crashes, or more severe security consequences. The flaw likely manifested when the system processed certain malformed or unexpected inputs that were not adequately filtered or validated before being processed by system components, potentially allowing attackers to manipulate memory structures in unintended ways.
From an operational impact perspective, this vulnerability posed significant risks to macOS environments, particularly in enterprise and high-security contexts where system stability and data integrity were paramount. Memory corruption issues of this nature can potentially lead to privilege escalation attacks, where an attacker might exploit the flaw to gain elevated system privileges or execute arbitrary code. The vulnerability's presence in systems prior to the mentioned versions meant that organizations running older macOS releases were exposed to potential exploitation attempts, making timely patching and system updates critical for maintaining security posture. Attackers could potentially leverage this flaw to compromise system integrity, access sensitive data, or establish persistent access points within affected environments.
The remediation for CVE-2018-4456 involved Apple releasing security updates that implemented improved input validation mechanisms throughout the affected macOS versions. These updates addressed the underlying memory corruption issue by strengthening the validation processes that govern how system components handle input data, thereby preventing the conditions that could lead to memory corruption. Organizations should have prioritized deployment of these updates to ensure their systems were protected against potential exploitation attempts. The fix aligns with recommended practices outlined in the MITRE ATT&CK framework, particularly in the context of defense against privilege escalation techniques and system compromise. Security professionals should have monitored for indicators of compromise related to this vulnerability and implemented appropriate network monitoring and endpoint protection measures to detect potential exploitation attempts. The vulnerability serves as an example of why continuous security updates and proper input validation are essential components of any robust cybersecurity program, demonstrating how seemingly simple validation issues can create significant security risks when left unaddressed.