CVE-2022-20197 in Android
Summary
by MITRE • 06/15/2022
In recycle of Parcel.java, there is a possible way to start foreground activity from background due to a permissions bypass. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12LAndroid ID: A-208279300
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Analysis
by VulDB Data Team • 06/15/2022
The vulnerability identified as CVE-2022-20197 resides within the Parcel.java component of Android 12L systems, representing a critical security flaw that enables unauthorized privilege escalation. This issue manifests through a permissions bypass mechanism that allows foreground activities to be initiated from background processes, fundamentally undermining the operating system's security model and access control mechanisms. The vulnerability specifically targets the recycle functionality of the Parcel class, which serves as a fundamental data structure for inter-process communication in Android applications.
The technical exploitation of this vulnerability stems from improper permission validation within the Parcel recycling process, where background applications can manipulate the system to launch foreground activities without proper authorization. This flaw operates at the core of Android's application sandboxing principles, allowing malicious code to bypass the normal foreground service restrictions that typically prevent background processes from initiating user-facing activities. The vulnerability's impact extends beyond simple privilege escalation as it enables attackers to potentially gain access to sensitive system resources and user data through the elevated privileges gained via this bypass mechanism.
From an operational standpoint, this vulnerability presents a severe risk to Android 12L devices as it requires no user interaction for exploitation, making it particularly dangerous in automated attack scenarios. The lack of user interaction requirements means that malicious actors can leverage this flaw silently in the background, potentially enabling them to perform actions such as accessing sensitive information, modifying system settings, or launching additional malicious payloads. The absence of additional execution privileges needed for exploitation further compounds the severity, as it allows even limited-privilege applications to achieve system-level access through this single vulnerability.
The implications of this vulnerability align with CWE-284, which addresses improper access control mechanisms, and can be mapped to ATT&CK technique T1068, which involves the exploitation of local privilege escalation vulnerabilities. Security professionals should consider this vulnerability as part of a broader threat landscape where background processes can be weaponized to gain unauthorized access to system resources, potentially leading to complete system compromise. The vulnerability's classification as a local privilege escalation issue means that successful exploitation could result in persistent access to the device, enabling long-term surveillance and data exfiltration capabilities.
Mitigation strategies should focus on implementing immediate system updates and patches provided by Google, as well as monitoring for suspicious foreground activity initiation from background processes. Organizations should also consider implementing additional security controls such as application whitelisting, enhanced monitoring of system calls, and regular security assessments to detect potential exploitation attempts. The vulnerability serves as a reminder of the critical importance of proper permission handling and access control validation within core system components, particularly those involved in inter-process communication and resource management.