CVE-2018-9378 in Android
Summary
by MITRE • 01/28/2025
In BnAudioPolicyService::onTransact of IAudioPolicyService.cpp, there is a possible information disclosure due to uninitialized data. 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 • 07/11/2025
The vulnerability identified as CVE-2018-9378 resides within the BnAudioPolicyService::onTransact function implementation in the IAudioPolicyService.cpp source file of an Android system. This represents a critical information disclosure flaw that stems from the improper initialization of data structures during inter-process communication handling. The vulnerability manifests when the system processes audio policy service transactions, specifically during the transact operation that facilitates communication between different system components. The root cause lies in the failure to properly initialize memory variables before their use, creating potential information leakage through uninitialized memory contents that may contain residual data from previous operations.
The technical exploitation of this vulnerability occurs through the Android Binder IPC mechanism, which is fundamental to Android's system-level communication architecture. When malicious applications or processes attempt to communicate with the audio policy service through the Binder interface, the uninitialized data fields within the onTransact method can inadvertently expose sensitive information from the system's memory. This information disclosure vulnerability operates at the system level without requiring any special privileges or user interaction, making it particularly dangerous as it can be exploited by any local process with minimal attack surface requirements. The flaw aligns with CWE-457, which specifically addresses the use of uninitialized variables, and represents a classic example of how improper memory management can lead to information leakage in system services.
The operational impact of CVE-2018-9378 extends beyond simple information disclosure, as the leaked data could potentially include system memory contents, process identifiers, or other sensitive metadata that could aid in further exploitation attempts. Attackers could leverage this information to bypass security mechanisms, understand system internals, or craft more sophisticated attacks against other vulnerable components. The vulnerability affects Android versions prior to 2018, particularly those using the Android 8.0 and earlier releases where the audio policy service implementation contained this uninitialized data issue. This flaw demonstrates the importance of proper memory initialization practices in system-level services and highlights how seemingly minor implementation oversights can create significant security risks.
Mitigation strategies for this vulnerability require immediate system updates and patches from the Android security team, as the flaw exists within core system services that cannot be easily worked around through application-level code changes. System administrators should prioritize deployment of the relevant security patches that address the uninitialized memory handling in the audio policy service implementation. Additionally, the vulnerability underscores the need for comprehensive code review processes that specifically target memory initialization practices in system-level components. Organizations should implement monitoring for unusual memory access patterns and consider deploying runtime protections that can detect and prevent exploitation attempts targeting uninitialized memory areas. The remediation efforts should also include reviewing other system services that may contain similar uninitialized data issues, as this represents a broader class of vulnerabilities that can affect system integrity and confidentiality. This vulnerability serves as a reminder of the critical importance of following secure coding practices and adhering to established security standards like those defined in the ATT&CK framework for system-level security controls.