CVE-2023-20904 in Android
Summary
by MITRE • 01/26/2023
In getTrampolineIntent of SettingsActivity.java, there is a possible launch of arbitrary activity due to an Intent mismatch in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12L Android-13Android ID: A-246300272
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Analysis
by VulDB Data Team • 09/02/2025
The vulnerability identified as CVE-2023-20904 resides within the SettingsActivity.java file of Android operating systems version 12L and 13, specifically within the getTrampolineIntent method. This flaw represents a critical security issue that enables unauthorized privilege escalation through improper intent handling mechanisms. The vulnerability stems from a mismatch in intent validation processes that allows malicious actors to manipulate the system into launching arbitrary activities without requiring any additional execution privileges or user interaction for exploitation.
The technical implementation of this vulnerability involves a flaw in how the Android system validates intent parameters within the SettingsActivity framework. When the getTrampolineIntent method processes incoming intents, it fails to properly verify the source and target components of the intent, creating a pathway for attackers to construct malicious intents that bypass normal security checks. This intent mismatch allows for the execution of unauthorized activities within the system context, effectively enabling local privilege escalation. The vulnerability operates at the system level where legitimate system components are tricked into executing unauthorized code through carefully crafted intent parameters.
From an operational perspective, this vulnerability presents a significant risk to Android devices running the affected versions as it allows for local privilege escalation without requiring any user interaction or additional execution privileges. The lack of user interaction requirement makes this vulnerability particularly dangerous as it can be exploited automatically without any human intervention. Attackers can leverage this flaw to gain elevated privileges on the device, potentially leading to complete system compromise. The impact extends beyond simple privilege escalation to include potential data theft, system modification, and unauthorized access to sensitive device functions. This vulnerability directly relates to CWE-707, which addresses improper neutralization of special elements in intent objects, and aligns with ATT&CK technique T1068, which involves exploiting legitimate credentials and system privileges for escalation.
The mitigation strategies for CVE-2023-20904 primarily involve implementing proper intent validation mechanisms within the SettingsActivity framework. Android security patches should enforce strict verification of intent parameters, ensuring that only legitimate system components can trigger the trampoline intent functionality. Developers should implement additional checks to validate the source and target components of intents before execution, preventing unauthorized activity launches. Organizations should prioritize immediate deployment of security updates and patches provided by Google for Android 12L and 13 versions. The fix should include enhanced input validation, proper intent source verification, and implementation of security controls that prevent the exploitation of intent mismatches. Additionally, system administrators should monitor for any suspicious activity patterns that might indicate exploitation attempts and maintain comprehensive logging of intent-related system events to support forensic analysis and incident response efforts.