CVE-2017-0387 in Android
Summary
by MITRE
An elevation of privilege vulnerability in Mediaserver could enable a local malicious application to execute arbitrary code within the context of a privileged process. This issue is rated as High because it could be used to gain local access to elevated capabilities, which are not normally accessible to a third-party application. Product: Android. Versions: 5.0.2, 5.1.1, 6.0, 6.0.1, 7.0, 7.1. Android ID: A-32660278.
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Analysis
by VulDB Data Team • 10/27/2022
The vulnerability identified as CVE-2017-0387 represents a critical elevation of privilege flaw within the Android Mediaserver component, which operates as a privileged system service responsible for handling media processing tasks. This issue affects multiple Android versions including 5.0.2, 5.1.1, 6.0, 6.0.1, 7.0, and 7.1, indicating a widespread impact across the Android ecosystem. The vulnerability resides in the mediaserver process which runs with system-level privileges, making it a prime target for exploitation by malicious applications seeking to escalate their privileges beyond normal application boundaries. The flaw allows a local malicious application to execute arbitrary code within the context of this privileged process, effectively bypassing normal security boundaries that should protect system-level operations.
The technical nature of this vulnerability stems from improper input validation and memory handling within the mediaserver component's media processing capabilities. When the mediaserver processes media files or commands from untrusted sources, it fails to properly validate or sanitize input parameters, creating opportunities for attackers to craft malicious inputs that can trigger buffer overflows, memory corruption, or other exploitable conditions. This type of vulnerability typically falls under CWE-121, which describes "Stack-based Buffer Overflow" or similar memory corruption issues that enable attackers to overwrite critical memory locations. The vulnerability's classification as High severity reflects the significant privilege escalation potential, as successful exploitation would grant the malicious application the same elevated privileges as the mediaserver process, potentially providing access to sensitive system resources, device functionality, or other privileged operations.
The operational impact of CVE-2017-0387 extends beyond simple privilege escalation, as it provides attackers with a persistent foothold within the Android system architecture. Once exploited, the malicious application could potentially access device storage, intercept communications, modify system files, or even disable security features. This vulnerability aligns with ATT&CK technique T1068, which describes "Exploitation for Privilege Escalation," where adversaries leverage software vulnerabilities to gain elevated privileges. The attack surface is particularly concerning because the mediaserver process is frequently invoked during normal device operation, making exploitation more likely to occur during routine media processing activities. The vulnerability essentially creates a backdoor mechanism that allows malicious applications to gain system-level access without requiring user interaction or physical access to the device.
Mitigation strategies for this vulnerability should focus on immediate system updates and patches provided by Google and device manufacturers. The Android security patch level released in April 2017 addressed this specific issue through improved input validation and memory handling within the mediaserver component. Organizations and users should ensure their Android devices are updated to the latest security patches, particularly those addressing the A-32660278 Android ID. Additional defensive measures include implementing application sandboxing policies, monitoring for unusual mediaserver process behavior, and maintaining network segmentation to limit potential lateral movement if exploitation occurs. Security professionals should also consider implementing runtime application protection measures and behavioral monitoring to detect anomalous patterns that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of secure coding practices in system-level components and highlights the need for comprehensive security testing of privileged processes to prevent similar issues from emerging in the future.