CVE-2022-20443 in Android
Summary
by MITRE • 06/28/2023
In hasInputInfo of Layer.cpp, there is a possible bypass of user interaction requirements due to a tapjacking/overlay attack. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-194480991
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Analysis
by VulDB Data Team • 07/21/2023
The vulnerability identified as CVE-2022-20443 represents a critical security flaw in Android's Layer.cpp implementation that undermines the system's user interaction requirements. This issue specifically affects Android 13 and is catalogued under Android ID A-194480991, demonstrating the severity of the threat within the mobile operating system ecosystem. The vulnerability stems from a design flaw in the hasInputInfo method that governs how the system processes input information from various layers within the graphical user interface architecture.
The technical exploitation of this vulnerability occurs through a tapjacking or overlay attack vector that allows malicious applications to bypass the normal user interaction requirements that should be enforced by the Android security model. This attack method leverages the ability of malicious actors to overlay their own graphical elements on top of legitimate user interface components, effectively intercepting and manipulating user inputs without proper authorization. The flaw essentially creates a pathway where the system fails to properly validate whether input events originate from legitimate sources or from malicious overlay applications that have been positioned to capture user interactions.
The operational impact of this vulnerability is particularly severe as it enables local privilege escalation without requiring any additional execution privileges or user interaction. This means that a malicious application with minimal permissions could potentially elevate its privileges to gain full system access, effectively breaking down the fundamental security boundaries that protect Android devices from unauthorized access. The implications extend beyond simple privilege escalation as this vulnerability could potentially allow attackers to access sensitive data, modify system configurations, or even install additional malicious software without detection.
From a cybersecurity perspective, this vulnerability aligns with several ATT&CK framework techniques including T1068 for exploit for privilege escalation and T1546 for event trigger execution. The CWE classification for this issue would likely fall under CWE-691, which covers insufficient protection of against overlay attacks or CWE-284, which addresses improper access control. The vulnerability represents a significant weakness in Android's input validation mechanisms and demonstrates the ongoing challenges in securing mobile operating systems against sophisticated overlay-based attacks that exploit the complex interaction between graphical layers and user input handling.
Organizations and users should implement immediate mitigations including ensuring all Android devices are updated to the latest security patches provided by Google, implementing robust application vetting processes for third-party applications, and monitoring for suspicious overlay applications that may attempt to exploit this vulnerability. System administrators should also consider deploying mobile device management solutions that can detect and prevent unauthorized overlay applications from running on corporate devices. The vulnerability underscores the importance of maintaining up-to-date security measures and highlights the critical need for continuous monitoring of mobile security frameworks to prevent exploitation of similar input validation flaws.