CVE-2017-0877 in Android
Summary
by MITRE
A remote code execution vulnerability in the Android media framework (libavc). Product: Android. Versions: 6.0. Android ID A-66372937.
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Analysis
by VulDB Data Team • 01/25/2021
The vulnerability identified as CVE-2017-0877 represents a critical remote code execution flaw within the Android media framework, specifically affecting the libavc library component. This vulnerability resides in the Android operating system's multimedia processing capabilities and was tracked under Android ID A-66372937. The issue manifests in Android version 6.0, which was part of the Marshmallow release cycle, making it a significant concern for devices running this operating system. The flaw occurs within the media framework's handling of certain video codec data, particularly when processing malformed or maliciously crafted media files that exploit buffer overflow conditions in the underlying library implementation. This vulnerability demonstrates the inherent risks associated with complex multimedia processing components that must handle diverse and potentially untrusted input formats from various sources.
The technical exploitation of CVE-2017-0877 occurs through a buffer overflow condition in the libavc library that processes H.264 video streams. When an Android device encounters a specially crafted video file containing malformed H.264 data, the media framework fails to properly validate input boundaries during the decoding process. This allows an attacker to overwrite adjacent memory locations in the application process, potentially leading to arbitrary code execution with the privileges of the media framework component. The vulnerability is classified as a buffer overflow according to CWE-121 and CWE-125, which specifically address issues related to insufficient boundary checking in memory operations. The flaw is particularly dangerous because it can be triggered through various attack vectors including email attachments, web content, or downloaded media files that are processed by the Android media framework when opened or played by the system.
The operational impact of this vulnerability extends beyond simple exploitation scenarios to encompass a wide range of potential attack surfaces within Android devices. Mobile devices running Android 6.0 are particularly vulnerable because the affected libavc library is integrated into the core media processing stack that handles video playback across numerous applications and system functions. An attacker could potentially deliver malicious content through various channels including phishing emails, compromised websites, or malicious applications that utilize the media framework for video processing. The remote code execution capability means that successful exploitation could allow attackers to gain full control over the affected device, potentially enabling data exfiltration, persistent backdoor installation, or further lateral movement within network environments. This vulnerability directly maps to ATT&CK technique T1203, which covers exploitation of remote services, and T1059, which involves command and scripting interpreters.
Mitigation strategies for CVE-2017-0877 require immediate patching of affected Android devices through official security updates from Google and device manufacturers. Organizations should prioritize deployment of the Android Security Bulletin updates that address this specific vulnerability, as the fix typically involves memory boundary checks and input validation improvements within the libavc library. Network administrators should consider implementing content filtering measures to prevent users from accessing potentially malicious media files, particularly in enterprise environments where device management is more controlled. Device users should be educated about the risks of opening untrusted media attachments and should avoid downloading content from unknown sources. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates how multimedia processing components can serve as attack vectors in mobile environments, emphasizing the need for robust input validation and memory safety practices in system libraries. Additionally, implementing mobile device management solutions can help ensure timely deployment of security patches and reduce the window of exposure for vulnerable devices.