CVE-2023-20916 in Android
Summary
by MITRE • 01/26/2023
In getMainActivityLaunchIntent of LauncherAppsService.java, there is a possible way to bypass the restrictions on starting activities from the background due to a missing permission check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12 Android-12LAndroid ID: A-229256049
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Analysis
by VulDB Data Team • 01/27/2023
The vulnerability identified as CVE-2023-20916 resides within the Android operating system's LauncherAppsService component, specifically in the getMainActivityLaunchIntent method implementation. This flaw represents a critical security oversight that allows unauthorized background activity initiation without proper permission validation. The vulnerability affects Android 12 and Android 12L versions, making it particularly concerning given the widespread adoption of these operating system releases. The issue stems from a missing permission check that should have validated whether an application has the appropriate authorization to launch activities from background processes, creating a pathway for privilege escalation.
The technical nature of this vulnerability aligns with CWE-284, which describes improper access control mechanisms that allow unauthorized users to access resources or perform actions they should not be permitted to execute. The flaw operates at the system level within the launcher service that manages application launching operations, specifically targeting the permission validation process that should prevent unauthorized background activity initiation. When an application attempts to launch another application's main activity from the background, the system fails to verify whether the requesting application possesses the necessary permissions, effectively bypassing the intended security controls.
From an operational perspective, this vulnerability enables local privilege escalation without requiring any additional execution privileges or user interaction for exploitation. The attack vector is particularly dangerous because it can be exploited silently in the background without alerting the user or requiring any form of input. An attacker with access to a compromised device could leverage this vulnerability to launch malicious applications or system components with elevated privileges, potentially gaining deeper access to sensitive system resources or data. The lack of user interaction requirement makes this vulnerability especially concerning for automated exploitation scenarios.
The security implications extend beyond simple activity launching, as this vulnerability could enable attackers to manipulate the system's application execution flow and potentially access protected system functionalities. The vulnerability's impact is amplified by the fact that it operates at the system service level, meaning that successful exploitation could allow attackers to bypass multiple layers of Android's security architecture. Organizations and users should be particularly concerned about this vulnerability as it represents a fundamental flaw in the Android permission system that could be exploited to gain unauthorized access to system resources or to execute malicious code with elevated privileges.
Mitigation strategies should focus on implementing immediate system updates from Android security patches that address the missing permission check in the LauncherAppsService. System administrators should prioritize applying these updates across all affected Android 12 and 12L devices to prevent exploitation. Additionally, organizations should conduct thorough security assessments to identify any potential unauthorized applications that may have been installed on devices prior to patching. The vulnerability's classification under ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation," indicates that this flaw could be leveraged as part of broader attack chains targeting system-level access. Regular monitoring of application behavior and implementation of robust application whitelisting policies can provide additional defense-in-depth measures against potential exploitation of this vulnerability.