CVE-2019-2216 in Android
Summary
by MITRE
In overlay notifications, there is a possible hidden notification due to improper input validation. This could lead to a local escalation of privilege because the user is not notified of an overlaying app, with User execution privileges needed. User interaction is needed for exploitation.Product: Android Versions: Android-10 Android ID: A-38390530
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Analysis
by VulDB Data Team • 03/16/2020
The vulnerability identified as CVE-2019-2216 resides within Android's overlay notification system, representing a critical security flaw that undermines user awareness and system integrity. This issue affects Android 10 and is categorized under the Android ID A-38390530, demonstrating the complexity of modern mobile operating system security challenges. The vulnerability specifically targets the mechanism that governs how applications display overlay notifications, which are designed to appear on top of other applications to capture user attention and convey important information.
The technical root cause of this vulnerability stems from inadequate input validation within the overlay notification framework, creating a scenario where malicious applications can exploit the system to display notifications without proper user awareness or consent. This flaw allows an application to create overlay notifications that bypass normal user interface controls and notification mechanisms. The improper validation occurs at the system level where the operating system fails to adequately verify the legitimacy and visibility of overlay notifications before presenting them to users. This weakness creates a pathway for attackers to manipulate the notification system and potentially deceive users into interacting with malicious overlays.
From an operational perspective, this vulnerability presents a significant risk for local privilege escalation attacks, as users remain unaware of the presence of overlaying applications that could be used for malicious purposes. The attack requires user execution privileges and user interaction to be exploited, meaning that while the vulnerability itself is not automatically exploitable, it creates a dangerous environment where users might unknowingly interact with malicious overlays. The impact extends beyond simple notification manipulation, as these overlays could be designed to capture sensitive information, perform unauthorized actions, or redirect users to malicious websites. This represents a clear violation of user trust and system security principles, as the fundamental assumption that users are aware of all active applications and their activities is compromised.
The security implications of CVE-2019-2216 align with common attack patterns documented in the ATT&CK framework, particularly under techniques related to privilege escalation and user interface deception. This vulnerability could be leveraged in conjunction with other attack vectors to create more sophisticated exploitation scenarios, where overlay notifications serve as a delivery mechanism for additional malicious payloads or as a means to bypass security controls. The CWE classification for this issue would likely fall under CWE-20, which addresses improper input validation, and potentially CWE-284, related to improper access control mechanisms. Organizations and users must understand that this vulnerability creates a persistent threat vector where malicious actors can maintain stealth while executing unauthorized operations, making it particularly dangerous in enterprise environments where user awareness and security controls are paramount.
Mitigation strategies for CVE-2019-2216 should focus on both immediate system updates and user education. Android security patches addressing this vulnerability should be implemented immediately, as they typically involve enhanced validation mechanisms for overlay notifications and stricter enforcement of user consent requirements. Users should be educated about the importance of being vigilant when interacting with applications that request overlay permissions and should be encouraged to review and revoke unnecessary overlay access. System administrators should monitor for suspicious overlay behavior and implement application control measures to prevent unauthorized overlay notification capabilities. The vulnerability highlights the broader challenge of managing overlay permissions in mobile environments and underscores the need for robust input validation mechanisms throughout the operating system's notification stack.