CVE-2018-4306 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 • 01/10/2025
The vulnerability identified as CVE-2018-4306 represents a classic use-after-free condition that emerged in Apple's ecosystem prior to the release of iOS 12 and related software versions. This type of memory corruption flaw occurs when a program continues to reference memory locations after they have been freed or deallocated, creating potential opportunities for malicious exploitation. The issue specifically affected multiple Apple platforms including mobile devices, desktop operating systems, and cloud synchronization software, demonstrating the widespread nature of the memory management flaw.
The technical implementation of this vulnerability stems from inadequate memory management practices within Apple's software frameworks. When applications handle memory allocation and deallocation processes, proper safeguards should ensure that pointers are invalidated immediately after memory release. However, in the affected versions, the memory management subsystem failed to properly enforce these safety mechanisms, allowing attackers to potentially manipulate freed memory regions. This condition falls under the CWE-416 vulnerability category, which specifically addresses the use of freed memory, and aligns with the broader class of memory safety issues that have historically been exploited in zero-day attacks.
The operational impact of CVE-2018-4306 extends across multiple attack vectors within the Apple ecosystem, particularly affecting user devices running older software versions. Mobile devices, desktop computers, and cloud synchronization clients all presented potential entry points for adversaries seeking to exploit this memory corruption vulnerability. Attackers could potentially leverage this flaw to execute arbitrary code, gain elevated privileges, or cause system instability. The vulnerability's presence in both iOS and macOS environments, along with iTunes and iCloud for Windows, created a comprehensive attack surface that could be exploited across different device types and operating environments, making it particularly dangerous for enterprise and individual users alike.
The remediation for this vulnerability required comprehensive memory management updates across Apple's software platforms, with the most effective mitigation occurring through the deployment of updated software versions including iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, and iCloud for Windows 7.7. These updates implemented improved memory management protocols that properly invalidate pointers upon memory deallocation, preventing the conditions that enabled the use-after-free scenario. Organizations and individual users needed to prioritize software updates to eliminate exposure to this vulnerability, as the attack surface remained significant until proper patches were applied. The vulnerability's resolution demonstrates the critical importance of proactive memory management in preventing exploitation opportunities that could lead to full system compromise, aligning with the ATT&CK framework's emphasis on memory corruption techniques as common attack patterns in modern cybersecurity threats.