CVE-2023-21135 in Android
Summary
by MITRE • 06/15/2023
In onCreate of NotificationAccessSettings.java, there is a possible failure to persist notifications settings due to improper input validation. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11 Android-12 Android-12L Android-13Android ID: A-260570119
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Analysis
by VulDB Data Team • 09/13/2025
The vulnerability identified as CVE-2023-21135 resides within the NotificationAccessSettings.java component of Android operating systems spanning versions 11 through 13. This flaw manifests in the onCreate method where inadequate input validation mechanisms fail to properly process notification settings modifications. The root cause stems from insufficient sanitization of user-provided parameters that govern notification access permissions, creating a pathway for malicious actors to manipulate the notification system configuration.
The technical implementation of this vulnerability allows for local privilege escalation through improper validation of notification access settings. When the system processes notification configuration changes, it fails to adequately verify the legitimacy of input parameters, potentially permitting unauthorized modifications to notification access controls. This validation failure creates a persistent security gap where malicious applications or processes can manipulate notification settings to gain elevated privileges without requiring additional execution permissions or user interaction. The vulnerability operates at the system level where notification access controls are managed, making it particularly dangerous as it can affect core system functionality.
From an operational standpoint, this vulnerability presents a significant risk to Android device security as it enables local privilege escalation without user interaction requirements. The attack vector does not necessitate physical access or complex exploitation techniques, making it particularly concerning for mobile device security. An attacker with local access to a device can leverage this vulnerability to modify notification settings and subsequently escalate privileges to gain system-level access. The impact extends beyond simple notification manipulation as it can potentially allow for broader system compromise through privilege escalation.
Security mitigations for this vulnerability should focus on implementing robust input validation mechanisms within the NotificationAccessSettings.java component. The recommended approach involves strengthening parameter validation to ensure all notification access settings modifications undergo comprehensive sanitization before processing. System administrators should apply the latest Android security patches and updates provided by Google to remediate this vulnerability. Additionally, organizations should implement monitoring solutions to detect anomalous notification access pattern changes that could indicate exploitation attempts. This vulnerability aligns with CWE-20, which addresses improper input validation, and maps to ATT&CK technique T1068, which covers local privilege escalation through system configuration manipulation. The remediation efforts should include code-level fixes that enforce strict validation of all notification access parameters and implement proper error handling for invalid inputs to prevent the privilege escalation scenario described in the vulnerability.