CVE-2026-49903 in Android
Summary
by MITRE • 11/02/2026
The `ClusterRenderingService.dump()` method, accessible to processes holding `android.permission.DUMP` and `android.permission.PACKAGE_USAGE_STATS`, acts as a confused deputy. It allows attackers to write arbitrary values to `Settings.Global.OVERLAY_DISPLAY_DEVICES`, an operation normally requiring `android.permission.WRITE_SECURE_SETTINGS`, enabling persistent creation of system overlay displays and injection of key events into the cluster UI.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in the ClusterRenderingService.dump() method represents a classic confused deputy scenario within the Android operating system architecture, where a privileged component is tricked into performing actions that exceed its intended scope or bypasses standard authorization checks for specific sensitive operations. This service acts as an intermediary that processes requests from applications holding either android.permission.DUMP or android.permission.PACKAGE_USAGE_STATS permissions. While these permissions are generally considered low-risk and necessary for diagnostic tools and usage statistics collection respectively, the implementation of this method fails to enforce strict access controls when interacting with system settings. Specifically, it allows any process possessing one of these lower-level permissions to write arbitrary values to Settings.Global.OVERLAY_DISPLAY_DEVICES. This setting is critical as it dictates how display devices are configured at a global level, and normally requires android.permission.WRITE_SECURE_SETTINGS for modification due to the high security implications associated with altering system-wide display configurations.
The technical flaw lies in the insufficient validation of caller privileges before executing the write operation on secure settings. By allowing processes with less restrictive permissions to modify OVERLAY_DISPLAY_DEVICES, the service effectively elevates their capabilities beyond what is intended by the Android permission model. This misconfiguration enables attackers who have compromised an application with either DUMP or PACKAGE_USAGE_STATS permissions to persistently create system overlay displays without needing the higher-level WRITE_SECURE_SETTINGS privilege. The ability to inject key events into the cluster UI further exacerbates the severity, as it allows for direct interaction with vehicle-specific interfaces that may control critical functions such as navigation, media playback, and potentially other safety-related features depending on the specific implementation of the cluster software.
The operational impact of this vulnerability is significant, particularly in automotive environments where the Android Automotive OS or similar frameworks are used to manage infotainment and instrument clusters. An attacker leveraging this flaw can establish persistent overlays that sit atop legitimate user interfaces, facilitating phishing attacks by displaying fake prompts for credentials or sensitive information. Furthermore, the injection of key events allows for automated manipulation of vehicle settings, potentially leading to unauthorized changes in display modes, brightness levels, or even triggering specific actions within connected applications. This persistence mechanism ensures that the malicious overlay remains active across reboots and application restarts, making it difficult for users to detect without specialized security tools. The confusion between diagnostic permissions and secure setting modification privileges undermines the principle of least privilege, creating a pathway for lateral movement if an attacker gains access to multiple components within the vehicle's network.
Mitigation strategies must focus on tightening permission checks within the ClusterRenderingService.dump() method. Developers should implement explicit verification that ensures only processes holding android.permission.WRITE_SECURE_SETTINGS can modify Settings.Global.OVERLAY_DISPLAY_DEVICES, regardless of other permissions held by the caller. Additionally, input validation should be applied to ensure that values written to this setting are within expected parameters and do not contain malicious payloads or unauthorized configurations. From a broader security architecture perspective, it is advisable to review all services exposed via dump() methods to identify similar confused deputy vulnerabilities where diagnostic interfaces inadvertently expose sensitive system functions. Regular code audits focusing on permission escalation paths and strict adherence to Android's security model regarding secure settings will help prevent such issues in future updates. Users should also be advised to keep their vehicle software up to date, as manufacturers may release patches addressing these privilege elevation flaws through standard OTA update mechanisms.