CVE-2023-40445 in iOS
Summary
by MITRE • 10/25/2023
The issue was addressed with improved UI handling. This issue is fixed in iOS 17.1 and iPadOS 17.1. A device may persistently fail to lock.
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Analysis
by VulDB Data Team • 09/11/2024
The vulnerability identified as CVE-2023-40445 represents a significant security flaw in Apple's mobile operating systems that affects the user interface handling mechanisms. This issue specifically impacts iOS 17.0 and iPadOS 17.0, where the system's lock screen functionality becomes compromised, potentially allowing unauthorized access to devices. The vulnerability stems from inadequate handling of user interface elements during the locking process, creating a persistent failure condition that prevents devices from properly securing themselves.
The technical flaw manifests through improper state management within the operating system's graphical user interface components. When a device attempts to lock the screen, the system fails to execute the complete locking sequence due to flawed UI handling routines. This creates a condition where the device remains in an unlocked state despite user intentions to secure the device. The vulnerability operates at the intersection of user interface rendering and system security protocols, where the failure to properly transition between UI states results in security boundary violations. According to CWE-284, this represents an improper access control vulnerability that allows unauthorized access to system resources through flawed privilege management.
The operational impact of this vulnerability extends beyond simple convenience issues to potentially serious security implications. Devices that fail to lock properly create persistent attack vectors for malicious actors who can exploit the unlocked state to access sensitive data, make unauthorized transactions, or execute malicious code. The persistent nature of the failure means that users may not immediately recognize the compromised security state, leading to extended periods of vulnerability. This vulnerability aligns with ATT&CK technique T1546.001 which involves privilege escalation through modifications to system processes, as the failure to lock creates a persistent access point that can be leveraged for further attacks.
Apple's response to this vulnerability involved implementing improved UI handling mechanisms in iOS 17.1 and iPadOS 17.1 updates. The fix addresses the root cause by enhancing the lock screen transition process and ensuring proper state management between UI components. Security researchers have noted that the update resolves the specific race condition that occurred during the locking sequence, where UI elements were not properly synchronized with system security protocols. The mitigation strategy focuses on strengthening the inter-process communication between the user interface framework and the security subsystem, ensuring that lock commands are properly executed and verified before the device enters the secured state.
Organizations and individual users should prioritize immediate deployment of the iOS 17.1 and iPadOS 17.1 updates to address this vulnerability. The persistent failure to lock represents a critical security gap that could be exploited by attackers with physical access to devices or those capable of executing malicious code. Additional mitigations include implementing device management policies that enforce automatic security updates and monitoring for unauthorized access attempts on affected systems. The vulnerability demonstrates the importance of proper UI state management in security-critical applications and highlights the need for comprehensive testing of user interface components for potential security implications.