CVE-2022-20007 in Android
Summary
by MITRE • 05/11/2022
In startActivityForAttachedApplicationIfNeeded of RootWindowContainer.java, there is a possible way to overlay an app that believes it's still in the foreground, when it is not, due to a race condition. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-10 Android-11 Android-12 Android-12LAndroid ID: A-211481342
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Analysis
by VulDB Data Team • 05/13/2022
The vulnerability identified as CVE-2022-20007 resides within the Android operating system's framework, specifically in the RootWindowContainer.java file where the startActivityForAttachedApplicationIfNeeded method operates. This flaw represents a race condition that enables malicious applications to potentially overlay legitimate foreground applications while maintaining the illusion that the original application remains active in the foreground. The vulnerability affects multiple Android versions including Android 10, 11, 12, and 12L, indicating a widespread impact across the Android ecosystem. The security implications are particularly severe as this vulnerability can be exploited to achieve local privilege escalation without requiring any additional execution privileges, making it accessible to attackers with minimal privileges.
The technical nature of this vulnerability stems from improper synchronization mechanisms during the application lifecycle management process. When an application attempts to start a new activity while another application is in the foreground, the race condition occurs between the time when the system determines the foreground application state and when the new activity is actually launched. This timing issue creates a window where malicious code can manipulate the display layer to overlay the legitimate application interface, while the application itself believes it maintains its foreground status. The underlying cause can be categorized under CWE-362, which deals with race conditions in security-sensitive contexts, and aligns with ATT&CK technique T1068 which involves exploiting local privilege escalation vulnerabilities.
The operational impact of this vulnerability extends beyond simple overlay attacks, as it provides a pathway for more sophisticated exploitation techniques that could lead to complete system compromise. Attackers could leverage this vulnerability to capture user credentials, perform fraudulent transactions, or gain access to sensitive application data while maintaining the appearance of normal application behavior. The requirement for user interaction suggests that social engineering or phishing techniques might be necessary to initially trigger the vulnerability, but once activated, the privilege escalation aspect makes this particularly dangerous. The vulnerability's presence in core Android framework components means that any application with the appropriate permissions could potentially exploit this flaw, making it a significant concern for device security.
Mitigation strategies for this vulnerability should focus on both immediate system updates and operational security measures. Android security patches released by Google address this specific race condition through improved synchronization mechanisms in the window container management system. Organizations should implement comprehensive patch management policies ensuring all Android devices receive security updates promptly. Additionally, users should be educated about the importance of keeping their devices updated and avoiding suspicious applications that might attempt to exploit such vulnerabilities. The vulnerability's classification under ATT&CK framework indicates that security monitoring should include detection of unusual application behavior patterns that might indicate overlay or foreground manipulation attempts. Network security teams should also consider implementing application whitelisting policies and monitoring for anomalous foreground application transitions that could signal exploitation attempts.