CVE-2023-40098 in Android
Summary
by MITRE • 12/05/2023
In mOnDone of NotificationConversationInfo.java, there is a possible way to access app notification data of another user due to a logic error in the code. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 12/24/2023
The vulnerability identified as CVE-2023-40098 represents a critical logic flaw in the Android notification system implementation within the NotificationConversationInfo.java component. This issue stems from improper access control mechanisms that allow unauthorized data exposure between user contexts, fundamentally compromising the isolation guarantees that Android maintains between different user profiles on the same device. The vulnerability specifically manifests in the mOnDone method where the application fails to properly validate user permissions when accessing notification conversation data, creating an unintended information disclosure channel.
The technical root cause of this vulnerability lies in a missing permission check or validation mechanism within the notification handling code path. When the mOnDone method executes, it processes notification conversation information without adequately verifying whether the calling process belongs to the same user context as the target notification data. This logical error creates a privilege escalation scenario where a malicious application or process can potentially access notification data belonging to other user profiles on the same device, effectively bypassing the Android security model's user isolation mechanisms. The vulnerability is classified as a logic error that violates the principle of least privilege and proper access control enforcement.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables unauthorized access to potentially sensitive notification content that may contain personal information, communication metadata, or other user-specific data. Attackers can exploit this vulnerability without requiring any user interaction or additional privileges, making it particularly dangerous in multi-user environments where multiple individuals share the same device. This could result in privacy violations, data leakage, and potential escalation to more severe security compromises depending on the nature of the notification content being accessed. The vulnerability affects the fundamental security boundary between user profiles, undermining the device's security posture and user privacy guarantees.
Security mitigations for this vulnerability should focus on implementing proper access control validation within the mOnDone method and other notification processing components. The fix requires adding explicit user context verification before accessing notification conversation data, ensuring that only processes belonging to the same user profile can access that specific notification information. Organizations should implement comprehensive code reviews focusing on access control mechanisms, particularly in notification and messaging components, while also monitoring for similar logic errors in other system components. This vulnerability aligns with CWE-284 (Improper Access Control) and can be mapped to ATT&CK technique T1059.001 (Command and Scripting Interpreter: PowerShell) in contexts where notification data access might be leveraged for further attacks. The remediation should include mandatory permission checks, proper user context validation, and comprehensive testing of access control mechanisms to prevent similar issues in future implementations.