CVE-2022-20551 in Android
Summary
by MITRE • 02/28/2023
In createTrack of AudioFlinger.cpp, there is a possible way to record audio without a privacy indicator due to a logic error in the code. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12 Android-12L Android-13Android ID: A-243376549
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Analysis
by VulDB Data Team • 04/21/2026
The vulnerability identified as CVE-2022-20551 resides within the AudioFlinger component of Android operating systems, specifically affecting versions 12, 12L, and 13. This flaw manifests in the createTrack function of AudioFlinger.cpp where a logic error permits unauthorized audio recording operations to occur without proper privacy indicators. The vulnerability represents a critical security gap in Android's audio processing framework that could potentially enable malicious actors to capture audio content while concealing their activities from users. The issue stems from insufficient validation mechanisms that should normally prevent unauthorized audio access and notify users of recording activities through visible privacy indicators.
The technical implementation of this vulnerability involves a logic error within the audio track creation process that fails to properly enforce privacy controls. When applications attempt to create audio tracks for recording purposes, the system should verify appropriate permissions and display privacy indicators to users. However, due to the flawed logic in AudioFlinger.cpp, this verification process can be bypassed, allowing audio recording to proceed without the expected user awareness mechanisms. This logic error effectively removes the privacy safeguards that normally protect users from unknowingly having their audio captured by applications. The flaw operates at the system level within the audio framework, making it particularly dangerous as it can be exploited by any application with sufficient privileges to access the audio subsystem.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential local privilege escalation capabilities. While the vulnerability itself does not require user interaction for exploitation, it can be leveraged by malicious applications to establish persistent audio monitoring capabilities. The fact that this vulnerability could lead to local privilege escalation with system execution privileges indicates that it may serve as a stepping stone for more sophisticated attacks targeting the underlying Android operating system. Attackers could potentially use this vulnerability to gain elevated privileges and subsequently access other system resources or data that would normally be protected from unauthorized access. This makes the vulnerability particularly concerning from a security perspective as it could enable comprehensive surveillance capabilities without user knowledge or consent.
The implications of this vulnerability align with several cybersecurity frameworks and threat modeling approaches. From a CWE perspective, this vulnerability corresponds to CWE-691, which addresses insufficient control flow protection, and CWE-310, related to cryptographic weakness. The ATT&CK framework categorizes this vulnerability under T1566, the initial access phase, where adversaries establish persistent access to systems through privilege escalation techniques. Additionally, the vulnerability fits within T1546, privilege escalation through system modification, as it allows unauthorized access to system-level audio recording capabilities. The lack of user notification mechanisms directly violates privacy protection principles that are fundamental to secure system design and user consent frameworks.
Mitigation strategies for CVE-2022-20551 should focus on immediate system updates and enhanced monitoring of audio access permissions. Android security patches addressing this vulnerability should be deployed immediately across all affected versions, as the flaw exists at the core audio processing framework level. Organizations should implement strict monitoring of audio recording activities and establish policies requiring explicit user consent for all audio access operations. System administrators should consider implementing additional security controls such as application whitelisting and privileged access management to limit the potential impact of this vulnerability. Regular security assessments should be conducted to verify that audio recording permissions are properly enforced and that privacy indicators function correctly. The vulnerability also highlights the importance of secure code review processes and input validation in system-level components to prevent similar logic errors from occurring in the future.