CVE-2020-0425 in Android
Summary
by MITRE
There is a possible way to view notifications even when the "Lockdown" feature is on. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-124000380
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Analysis
by VulDB Data Team • 09/18/2020
The vulnerability identified as CVE-2020-0425 represents a critical security flaw in Android 11 systems that undermines the intended functionality of the Lockdown feature. This weakness allows unauthorized access to system notifications even when the device is secured through the Lockdown mechanism, which is designed to prevent access to sensitive information and system functions. The vulnerability specifically affects the notification handling system within Android 11, where the security boundaries established by Lockdown are bypassed through a flaw in the permission model or notification filtering mechanism. The issue demonstrates a fundamental failure in the security architecture that governs how notifications are processed and displayed when a device is in a locked state.
The technical implementation of this vulnerability stems from a misconfiguration in the Android notification subsystem that fails to properly enforce access controls when Lockdown mode is active. This flaw likely exists in the kernel-level components responsible for managing notification queues and access permissions, where the system does not adequately validate whether a requesting process or user context should be granted access to notifications under Lockdown restrictions. The vulnerability can be exploited through local system components or applications that have basic user privileges, eliminating the need for elevated permissions or complex attack vectors. This characteristic places the vulnerability within the realm of CWE-284, which addresses improper access control issues in software systems.
The operational impact of this vulnerability extends beyond simple information disclosure, as it compromises the fundamental security assumptions of device lock mechanisms. Attackers can potentially access sensitive information such as messages, alerts, and system notifications without requiring physical access or additional authentication steps. This creates a significant risk for users in environments where device security is paramount, as the Lockdown feature is typically employed to protect against unauthorized access when devices are unattended or in potentially compromised states. The vulnerability undermines the trust model that users place in their device security features, particularly when Lockdown is enabled for maximum protection.
Mitigation strategies for CVE-2020-0425 should focus on immediate system updates from Google, as the vulnerability requires core Android system modifications to address the underlying access control flaw. Users should ensure their Android 11 devices are updated to the latest security patches, which typically include modifications to notification handling routines and access control enforcement mechanisms. System administrators and security teams should conduct comprehensive assessments of their Android device management policies, particularly regarding Lockdown feature usage and notification access controls. The vulnerability also highlights the importance of maintaining current security configurations and implementing additional monitoring for unauthorized notification access attempts. Organizations should consider implementing device-level security policies that restrict notification access even when Lockdown is active, and establish regular security audits to verify proper enforcement of access controls.
This vulnerability aligns with ATT&CK technique T1070.004, which covers the use of system logs and notification systems for information gathering, and demonstrates how improper access control can enable adversaries to collect sensitive data through legitimate system interfaces. The flaw represents a classic case of privilege escalation through notification system manipulation, where basic user privileges are sufficient to bypass security controls that should otherwise prevent access to system information. The vulnerability's classification as a local information disclosure issue places it within the broader category of security boundary violations that can compromise the integrity and confidentiality of device data.