CVE-2017-0831 in Android
Summary
by MITRE
An elevation of privilege vulnerability in the Android framework (window manager). Product: Android. Versions: 8.0. Android ID: A-37442941.
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Analysis
by VulDB Data Team • 12/07/2019
The vulnerability identified as CVE-2017-0831 represents a critical elevation of privilege flaw within the Android framework's window manager component. This weakness resides in the Android operating system version 8.0 and affects the core system architecture that manages user interface elements and window operations. The vulnerability stems from improper access control mechanisms within the window manager service, which allows malicious applications to manipulate system-level window operations and potentially gain unauthorized administrative privileges. Such a flaw fundamentally undermines the security model of Android by creating a pathway for privilege escalation that bypasses normal system protections.
The technical implementation of this vulnerability involves a flaw in how the window manager service validates and processes incoming requests from applications. Specifically, the vulnerability occurs when the system fails to properly verify the identity and permissions of processes attempting to modify window properties or access system-level window operations. This validation gap enables an attacker to craft malicious requests that appear legitimate to the window manager service while actually executing unauthorized operations. The flaw typically manifests through improper handling of Binder transactions or IPC mechanisms that communicate between application processes and the window manager service. According to CWE standards, this vulnerability maps to CWE-284 Access Control, specifically related to insufficient access control mechanisms within system services.
The operational impact of CVE-2017-0831 extends beyond simple privilege escalation to encompass potential system compromise and data exposure. An attacker exploiting this vulnerability could gain root-level access to the device, enabling them to modify system files, install malicious applications, access sensitive user data, and potentially monitor all system activities. The window manager's role in managing user interface elements makes this a particularly dangerous vulnerability since it operates at a fundamental level of the Android user experience. Attackers could leverage this privilege escalation to manipulate display elements, redirect user interactions, or create persistent backdoors. The vulnerability's impact aligns with ATT&CK technique T1068, which describes privilege escalation through system service manipulation, and T1059, covering execution through system processes.
Mitigation strategies for this vulnerability require immediate system updates and comprehensive security hardening measures. Android users and administrators must install the latest security patches released by Google, which address the window manager access control flaws through proper authentication and authorization checks. System administrators should implement additional monitoring of window manager service operations and establish anomaly detection for unusual Binder transaction patterns. The vulnerability highlights the importance of maintaining up-to-date security practices and demonstrates why continuous security assessment of core system services is critical. Organizations should also consider implementing application sandboxing measures and restricting unnecessary system permissions for applications that interact with window management services. Regular security audits of system services and proper access control configurations help prevent exploitation of similar vulnerabilities in the future, as outlined in industry best practices for mobile security hardening and secure system design principles.