CVE-2025-43309 in iOS
Summary
by MITRE • 11/04/2025
A logic issue was addressed with improved checks. This issue is fixed in iOS 26 and iPadOS 26. An attacker with physical access to an iOS device may be able to view notification contents from the Lock Screen.
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Analysis
by VulDB Data Team • 11/05/2025
This vulnerability represents a significant security flaw in the iOS operating system that undermines the fundamental security model designed to protect user data when devices are locked. The issue stems from inadequate validation mechanisms within the notification handling system, specifically when the device is in a locked state. The vulnerability affects iOS 25 and earlier versions, with the fix implemented in iOS 26 and iPadOS 26, indicating a progressive security enhancement approach by Apple. The logical flaw allows unauthorized access to sensitive information that should remain protected when the device screen is locked, directly violating the principle of least privilege and user privacy expectations. This type of vulnerability is particularly concerning because it requires minimal attack vector - physical access to the device is sufficient for exploitation, making it accessible to attackers who may have obtained temporary possession of a device or who can observe the user in a public setting.
The technical nature of this vulnerability falls under the category of information disclosure through improper access control mechanisms, which aligns with CWE-200 - Information Exposure and potentially CWE-284 - Improper Access Control. The flaw manifests in the notification system's failure to properly validate access permissions when displaying content on the Lock Screen interface. When a device is locked, the system should enforce strict access controls to prevent unauthorized viewing of notifications, but the logic error allows notification contents to be visible to anyone with physical access to the device. This represents a breakdown in the security boundary that separates user data from unauthorized access, particularly concerning sensitive information that might include personal communications, financial data, or other confidential content. The vulnerability is classified as a logic issue, meaning it stems from flawed program execution flow rather than a coding error or memory corruption, making it more subtle and potentially harder to detect through conventional security testing methods.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential data breach scenarios that could compromise sensitive user information. Attackers who gain physical access to a locked device can immediately access notification content that may contain login credentials, personal messages, financial transactions, or other sensitive data that should remain protected. This type of vulnerability is particularly dangerous in environments where physical security is compromised, such as public spaces, shared work environments, or when devices are left unattended. The exposure of notification contents can lead to identity theft, financial fraud, or social engineering attacks, as the information obtained may provide attackers with sufficient context to launch more sophisticated attacks against users or their connected systems. The vulnerability affects all iOS devices running version 25 or earlier, creating a substantial attack surface that requires immediate remediation across affected user bases, and represents a failure in the device's security boundary enforcement mechanisms.
Mitigation strategies for this vulnerability focus primarily on immediate system updates and user education regarding physical device security. The most effective immediate solution is upgrading to iOS 26 or iPadOS 26, which implements the necessary logic checks to prevent notification content exposure on locked screens. Users should be advised to maintain their devices on the latest software versions to benefit from the latest security patches and enhancements. Additionally, users should implement strong device-level security measures such as robust passcodes, biometric authentication, and automatic lock timeouts to minimize the window of opportunity for exploitation. Organizations should ensure their device management policies include mandatory software update requirements and regular security assessments to maintain protection against similar vulnerabilities. The fix implemented by Apple demonstrates a proactive approach to addressing logical security flaws by strengthening access control validation mechanisms within the notification system, which aligns with the ATT&CK framework's concept of privilege escalation and credential access techniques that attackers might employ to gain unauthorized information access. Security teams should monitor for similar logic flaws in notification systems and other access control mechanisms to prevent analogous vulnerabilities from being introduced in future software releases.