CVE-2022-20320 in Android
Summary
by MITRE • 08/12/2022
In ActivityManager, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-187956596
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Analysis
by VulDB Data Team • 09/11/2022
This vulnerability exists within the Android ActivityManager component and represents a significant information disclosure flaw that undermines the platform's security model. The issue stems from improper handling of application state information through side channel mechanisms that inadvertently reveal whether specific applications are installed on the device. The vulnerability specifically affects Android 13 and is identified by Android ID A-187956596. The flaw allows attackers to determine application installation status without requiring any query permissions or additional execution privileges, effectively bypassing the normal security boundaries that should protect application metadata from unauthorized access.
The technical implementation of this vulnerability exploits timing variations and observable behavioral differences in the ActivityManager's response handling when processing requests for application information. Attackers can leverage these side channel artifacts to infer installation status through subtle timing differences or response patterns that vary depending on whether target applications are present on the device. This type of information disclosure falls under the CWE-203 weakness category, which specifically addresses "Information Dislosure: Observable Behavior" where system behavior reveals sensitive information through observable differences in system responses. The vulnerability operates at the system level within the Android framework, making it particularly concerning as it affects core platform components rather than individual applications.
The operational impact of CVE-2022-20320 extends beyond simple information gathering, as it enables adversaries to build comprehensive profiles of installed applications on target devices. This capability can serve as a foundation for more sophisticated attacks, including targeted malware deployment, social engineering campaigns, or privilege escalation attempts that rely on knowledge of installed applications. The vulnerability is particularly dangerous because it requires no user interaction for exploitation, making it suitable for automated reconnaissance and surveillance operations. From an ATT&CK framework perspective, this vulnerability maps to the T1069.001 technique for "Permission Groups" and potentially T1592 for "Get Access" through information gathering activities. The lack of additional execution privileges required for exploitation means that even sandboxed applications or unprivileged processes can leverage this vulnerability to gather sensitive information about other applications on the device.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and response normalization within the ActivityManager component to eliminate timing variations that could be exploited. Android security updates should include modifications to how the system handles application state queries, ensuring that responses do not vary based on installation status. Organizations should also implement network monitoring to detect unusual patterns of application enumeration activities and consider deploying mobile device management solutions that can enforce stricter application permission controls. The vulnerability demonstrates the importance of considering side channel attacks in security design and highlights the need for comprehensive security testing that includes behavioral analysis and timing attack simulations. Regular security assessments of core Android components should be conducted to identify similar information disclosure vulnerabilities that could be exploited to undermine system security.