CVE-2018-4313 in watchOS
Summary
by MITRE
A consistency issue existed in the handling of application snapshots. The issue was addressed with improved handling of message deletions. This issue affected versions prior to iOS 12, tvOS 12, watchOS 5.
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Analysis
by VulDB Data Team • 08/22/2023
The vulnerability identified as CVE-2018-4313 represents a consistency issue within the application snapshot handling mechanisms of Apple's mobile operating systems. This flaw existed in the way the system managed application snapshots, which are critical components used to maintain application state and provide seamless user experiences across multitasking scenarios. The issue specifically manifested in the improper handling of message deletions within these snapshot contexts, creating potential inconsistencies that could be exploited by malicious actors. The vulnerability affected iOS versions prior to 12.0, tvOS versions prior to 12.0, and watchOS versions prior to 5.0, indicating a widespread impact across Apple's mobile ecosystem.
The technical nature of this vulnerability stems from inadequate synchronization and consistency mechanisms when application snapshots interact with message deletion operations. When applications are suspended or backgrounded, the system creates snapshots to preserve their state and enable quick resumption. However, the flaw occurred when message deletions were processed within these snapshot contexts, leading to potential data corruption or inconsistent states that could be leveraged for privilege escalation or information disclosure. This type of consistency issue falls under the broader category of software reliability problems that can compromise system integrity and security boundaries. The vulnerability demonstrates a failure in maintaining proper state management during critical system operations, creating potential attack vectors through which adversaries could manipulate application states or extract sensitive information.
The operational impact of CVE-2018-4313 extends beyond simple data inconsistency issues, as it could potentially enable attackers to gain unauthorized access to application data or manipulate application behavior in ways that compromise user privacy and system security. Mobile operating systems rely heavily on snapshot mechanisms for efficient multitasking and application management, making this vulnerability particularly concerning for environments where sensitive data processing occurs. The issue could potentially be exploited to bypass security controls that depend on proper state management or to create persistent access mechanisms through manipulated application states. Given that this vulnerability affected multiple Apple platforms including mobile devices, tablets, and wearables, the potential attack surface was substantial, with implications for user privacy and data protection across various device types.
Apple addressed this vulnerability through improved handling of message deletions within the snapshot management system, implementing enhanced consistency checks and synchronization mechanisms. The fix likely involved strengthening the atomicity of operations when processing message deletions in snapshot contexts, ensuring that all related state changes occur consistently or are rolled back if inconsistencies are detected. This remediation approach aligns with established security practices for maintaining data integrity in concurrent systems, similar to techniques described in the common weakness enumeration framework under CWE-116 for improper handling of synchronous operations. Organizations should ensure all affected devices are updated to the patched versions of iOS 12, tvOS 12, and watchOS 5 to eliminate this vulnerability from their environments. The remediation process demonstrates the importance of proper state management in security-critical systems and highlights the need for comprehensive testing of edge cases involving concurrent operations and state transitions in mobile operating system components.