CVE-2022-20264 in Android
Summary
by MITRE • 10/30/2023
In Usage Stats Service, 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.
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Analysis
by VulDB Data Team • 10/29/2024
The vulnerability identified as CVE-2022-20264 resides within the Usage Stats Service component of Android operating systems, representing a significant information disclosure flaw that undermines user privacy and system security. This vulnerability operates through side channel attacks that exploit the way the system handles usage statistics and application presence detection, creating an avenue for unauthorized information gathering without requiring any special privileges or user interaction. The flaw specifically affects the mechanism by which the system reports application usage data and can be leveraged to determine whether specific applications are installed on a device, even when traditional query permissions would normally prevent such access. This represents a fundamental breach in the system's access control mechanisms, where the intended security boundaries are bypassed through indirect information channels.
The technical implementation of this vulnerability stems from the improper handling of application presence information within the Usage Stats Service, which maintains detailed records of application usage patterns and system interactions. When applications interact with the usage statistics system, the service inadvertently exposes timing information and memory access patterns that can be analyzed to infer the presence of specific applications. This occurs because the system's response times and memory allocation patterns differ when querying for installed versus non-installed applications, creating a side channel that can be exploited by malicious actors. The vulnerability is particularly concerning because it operates entirely within the legitimate system boundaries, making detection difficult and exploitation straightforward. According to CWE-203, this represents a "Observable Behavioral Changes" weakness where system behavior reveals sensitive information through timing or resource usage patterns rather than direct data leakage.
The operational impact of CVE-2022-20264 extends beyond simple information disclosure, as it enables adversaries to build detailed profiles of user application usage patterns and device configurations. Attackers can leverage this vulnerability to perform reconnaissance activities that reveal personal information about users' digital habits, installed applications, and potentially sensitive business or personal data. The lack of required user interaction or additional execution privileges makes this vulnerability particularly dangerous as it can be exploited automatically without any user awareness or consent. This type of attack aligns with ATT&CK technique T1083, "File and Directory Discovery," where adversaries gather information about the system's application and file structure to plan further attacks. The vulnerability essentially allows for passive reconnaissance that can be combined with other techniques to build comprehensive attack profiles, making it a valuable tool in the hands of threat actors seeking to understand their targets.
Mitigation strategies for CVE-2022-20264 should focus on strengthening the system's resistance to side channel attacks through improved information flow control and timing obfuscation mechanisms. Android security updates addressing this vulnerability typically involve modifying the Usage Stats Service to eliminate timing variations in response handling and implementing consistent response patterns regardless of application presence. Organizations should ensure immediate deployment of relevant security patches and consider implementing additional monitoring for unusual usage statistics queries that might indicate exploitation attempts. System administrators should also review application permissions and usage statistics access controls to minimize potential attack surface, while security researchers should monitor for similar side channel vulnerabilities in related system components. The vulnerability highlights the importance of considering side channel attack vectors during security design phases and demonstrates how seemingly benign system functionality can be weaponized for information gathering purposes, emphasizing the need for comprehensive security testing methodologies that account for indirect attack paths.