CVE-2017-0838 in Android
Summary
by MITRE
An elevation of privilege vulnerability in the Android media framework (libstagefright). Product: Android. Versions: 7.0, 7.1.1, 7.1.2. Android ID: A-63522818.
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Analysis
by VulDB Data Team • 12/07/2019
The vulnerability identified as CVE-2017-0838 represents a critical elevation of privilege flaw within the Android media framework, specifically affecting the libstagefright component that handles multimedia processing. This vulnerability resides in the Android operating system's media playback infrastructure and was discovered to potentially allow malicious actors to execute arbitrary code with elevated system privileges. The affected versions include Android 7.0 Nougat, Android 7.1.1, and Android 7.1.2, which together represent a significant portion of devices running the Android platform during that time period. The vulnerability was assigned Android ID A-63522818, indicating its classification within Google's internal tracking system for Android security issues.
The technical root cause of CVE-2017-0838 stems from improper input validation within the media framework's parsing mechanisms. When processing specially crafted multimedia files, the libstagefright component fails to properly validate buffer boundaries and memory allocations, leading to potential memory corruption vulnerabilities. This flaw allows attackers to manipulate the media processing pipeline in such a way that they can overwrite critical memory locations or execute arbitrary code within the context of the media framework. The vulnerability specifically manifests during the parsing of media files, particularly those containing malformed or maliciously constructed data structures that exploit the framework's handling of various media formats including but not limited to mp4, mpeg, and other common multimedia containers.
The operational impact of this vulnerability extends far beyond simple media playback functionality, as it provides attackers with a pathway to escalate privileges from regular application context to system-level access. An attacker who successfully exploits this vulnerability could gain complete control over the affected device, potentially enabling them to install malicious applications, access sensitive user data, modify system files, or even establish persistent backdoors. This elevation of privilege capability makes the vulnerability particularly dangerous as it essentially provides a gateway to full device compromise without requiring physical access or user interaction beyond the simple act of playing a malicious media file. The vulnerability affects all Android devices running the specified versions, making it a widespread concern across the Android ecosystem.
Mitigation strategies for CVE-2017-0838 primarily focus on prompt system updates and patches provided by Google and device manufacturers. The most effective remediation involves applying the security patches released as part of the Android security bulletin for the affected period, which typically include fixes to the libstagefright component's buffer handling and input validation mechanisms. Organizations and users should prioritize updating their Android devices to versions that contain the patched libstagefright implementation, with particular attention to ensuring that device manufacturers have provided timely security updates. Additionally, network-level protections such as media file filtering and sandboxing mechanisms can provide additional defense-in-depth measures. From a cybersecurity perspective, this vulnerability aligns with CWE-121, which covers stack-based buffer overflow conditions, and represents a classic example of how media processing frameworks can become attack vectors when proper input validation is absent. The vulnerability also maps to ATT&CK technique T1068, which involves exploiting elevated privileges through local system exploitation, making it a critical concern for organizations implementing mobile device management policies and security monitoring solutions.