CVE-2018-9377 in Android
Summary
by MITRE • 11/28/2024
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 • 12/19/2024
The vulnerability identified as CVE-2018-9377 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 manifests through the improper handling of uninitialized data structures during inter-process communication operations. The issue stems from the audio policy service component responsible for managing audio routing and policy decisions across different audio modules within the Android framework. When the system processes transactions related to audio policy management, it fails to properly initialize certain data members before utilizing them, creating potential pathways for sensitive information leakage.
The technical exploitation of this vulnerability occurs through the Android Binder IPC mechanism, where malicious applications or processes can craft specific transactions to trigger the uninitialized data access pattern. This flaw falls under the Common Weakness Enumeration category CWE-457, which specifically addresses the use of uninitialized variables, and more broadly aligns with CWE-200, concerning information exposure. The vulnerability operates at the system level within the Android framework, making it particularly dangerous as it can be exploited by applications with minimal privileges or even by system components themselves. The exploitation requires no user interaction, making it highly concerning for security practitioners as it can be leveraged automatically without requiring any form of social engineering or user deception.
The operational impact of CVE-2018-9377 extends beyond simple information disclosure, as the uninitialized data may contain sensitive system information including memory addresses, configuration parameters, or even remnants of previously processed audio policy data. Attackers could potentially extract cryptographic keys, authentication tokens, or other confidential information that could be used for further exploitation or lateral movement within the system. This vulnerability particularly affects devices running vulnerable versions of Android where the audio policy service is active and accessible. The security implications are compounded by the fact that the audio policy service typically operates with elevated privileges, potentially allowing attackers to gain access to additional system resources or information that should remain protected. This flaw represents a significant weakness in the Android security model, as it demonstrates how seemingly isolated components within the system can create information leakage pathways that compromise overall system integrity.
Mitigation strategies for CVE-2018-9377 should focus on ensuring proper initialization of all data structures within the audio policy service implementation. The recommended approach involves updating the BnAudioPolicyService::onTransact function to explicitly initialize all variables and data members before their first use, thereby eliminating the possibility of uninitialized data disclosure. System administrators should implement the latest Android security patches and updates provided by Google, as these typically contain fixes for such vulnerabilities. Additionally, organizations should consider implementing runtime monitoring and anomaly detection systems to identify unusual patterns in audio policy service interactions that might indicate exploitation attempts. The vulnerability also underscores the importance of secure coding practices and thorough code reviews, particularly for system-level components that handle inter-process communication and privilege escalation scenarios. Security teams should conduct regular vulnerability assessments focusing on IPC mechanisms and system services to identify similar uninitialized variable issues that could present similar security risks.