CVE-2018-4312 in iCloud
Summary
by MITRE
A use after free issue was addressed with improved memory management. This issue affected versions prior to iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, iCloud for Windows 7.7.
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Analysis
by VulDB Data Team • 01/03/2025
The vulnerability identified as CVE-2018-4312 represents a critical use-after-free condition that existed in multiple Apple software platforms including iOS, tvOS, Safari, and various Windows applications. This memory management flaw arises when a program continues to reference memory that has already been freed or deallocated, creating potential opportunities for malicious code execution. The vulnerability specifically affected versions prior to iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, and iCloud for Windows 7.7, indicating a widespread impact across Apple's ecosystem. The issue stems from inadequate memory management practices where the system fails to properly track and validate memory references after objects have been destroyed or released from memory. This type of vulnerability falls under the CWE-416 category, which specifically addresses the use of freed memory, making it a direct descendant of the well-known memory safety issues that plague modern software systems. From an operational perspective, this vulnerability presents significant risks to system integrity and user security, as attackers could potentially exploit the freed memory references to execute arbitrary code or escalate privileges. The attack surface is particularly broad given that it affects multiple platforms and applications, including web browsers, operating systems, and synchronization services. The memory management flaw likely occurs during object lifecycle management where the application fails to properly invalidate pointers or clear references after memory deallocation, creating a window of opportunity for exploitation. The technical nature of this vulnerability aligns with ATT&CK technique T1059, which involves executing malicious code through compromised applications, as attackers could leverage the freed memory to inject and run malicious payloads. The impact extends beyond individual device compromise to potentially affect entire user networks, especially when considering the widespread adoption of these Apple applications across enterprise environments. The vulnerability's remediation required Apple to implement enhanced memory management protocols that properly track object references and prevent access to deallocated memory regions. This fix demonstrates the importance of proper memory lifecycle management in preventing security exploits and aligns with industry best practices for secure coding standards. The resolution involved updating the underlying memory management systems to ensure that when objects are freed, all references to those objects are properly invalidated and cannot be accessed by subsequent operations. The vulnerability's classification as a use-after-free issue places it within the broader context of memory safety vulnerabilities that have historically been among the most exploited classes of security flaws in software systems. The affected platforms represent critical touchpoints for user interaction and data synchronization, making the exploitation potential particularly concerning for both individual users and enterprise environments. The remediation process required comprehensive updates across multiple software platforms to ensure consistent memory management behavior and prevent similar vulnerabilities from emerging in future versions. Security researchers and penetration testers should consider this vulnerability when assessing the security posture of environments running affected software versions, as it represents a well-documented attack vector that could be leveraged for privilege escalation or remote code execution. The vulnerability's resolution serves as a reminder of the critical importance of proper memory management in preventing security exploits and maintaining system integrity across all software platforms.