CVE-2018-4258 in macOS
Summary
by MITRE
In macOS High Sierra before 10.13.5, a buffer overflow was addressed with improved bounds checking.
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Analysis
by VulDB Data Team • 04/29/2020
The vulnerability identified as CVE-2018-4258 represents a critical buffer overflow flaw discovered in macOS High Sierra versions prior to 10.13.5. This issue resides within the operating system's core components and demonstrates the inherent risks associated with improper memory management practices in system-level software. The vulnerability stems from inadequate bounds checking mechanisms that fail to properly validate input data sizes before processing them in memory buffers. Such oversights create exploitable conditions where malicious actors can manipulate program execution flow by overwriting adjacent memory locations with crafted inputs.
The technical implementation of this buffer overflow vulnerability occurs when the system processes user-supplied data without sufficient validation of buffer boundaries. This flaw allows attackers to write data beyond the allocated memory space, potentially corrupting adjacent memory regions and enabling arbitrary code execution. The vulnerability's classification aligns with CWE-121, which specifically addresses stack-based buffer overflow conditions, and may also relate to CWE-122 for heap-based buffer overflows depending on the specific implementation context. The flaw essentially creates a pathway for privilege escalation attacks where unprivileged users could potentially gain elevated system privileges through carefully constructed input sequences.
From an operational impact perspective, this vulnerability presents significant risks to macOS environments, particularly in enterprise settings where system integrity and user isolation are paramount. Attackers exploiting this vulnerability could execute malicious code with system-level privileges, potentially leading to complete system compromise, data exfiltration, or persistent backdoor installations. The attack surface extends beyond simple local exploitation to include potential remote attack vectors, especially when the vulnerable system components interact with external data sources. The vulnerability's presence in the operating system's core functionality means that successful exploitation could affect critical system services, user authentication mechanisms, and overall system stability. Organizations running affected macOS versions face increased risk of advanced persistent threats and zero-day exploitation attempts.
Mitigation strategies for CVE-2018-4258 primarily focus on immediate remediation through official software updates from Apple. The release of macOS 10.13.5 addressed this vulnerability through enhanced bounds checking mechanisms and improved memory management practices. System administrators should implement comprehensive patch management procedures to ensure all endpoints receive the necessary security updates promptly. Additional protective measures include implementing network segmentation, monitoring for unusual system behavior, and maintaining robust backup and recovery procedures. The vulnerability's resolution demonstrates the importance of continuous security monitoring and timely patch deployment in maintaining system integrity. Organizations should also consider implementing application whitelisting policies and privilege separation mechanisms to limit potential exploitation impact even if vulnerabilities remain unpatched. Security teams should conduct regular vulnerability assessments and maintain awareness of similar memory corruption issues that may affect other system components or third-party applications running on affected systems.