CVE-2020-22016 in FFmpeg
Summary
by MITRE • 05/28/2021
A heap-based Buffer Overflow vulnerability in FFmpeg 4.2 at libavcodec/get_bits.h when writing .mov files, which might lead to memory corruption and other potential consequences.
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Analysis
by VulDB Data Team • 05/30/2021
The heap-based buffer overflow vulnerability identified as CVE-2020-22016 resides within FFmpeg version 4.2 and specifically affects the libavcodec/get_bits.h component during the processing of .mov file formats. This vulnerability represents a critical security flaw that can be exploited to compromise system integrity and potentially execute arbitrary code. The issue manifests when FFmpeg attempts to handle malformed or specially crafted .mov files, where the application fails to properly validate buffer boundaries during bitstream parsing operations. The vulnerability stems from inadequate input validation mechanisms that allow attackers to manipulate memory allocation patterns within the heap structure, creating conditions where data can be written beyond allocated buffer limits.
The technical exploitation of this vulnerability occurs through carefully constructed .mov files that trigger improper memory handling within the get_bits.h module. When FFmpeg processes these malicious files, the buffer overflow can overwrite adjacent memory locations, potentially corrupting heap metadata or other critical program data structures. This type of vulnerability falls under CWE-121, heap-based buffer overflow, which is classified as a memory safety error that can lead to unpredictable program behavior, application crashes, or more severe security consequences. The operational impact extends beyond simple memory corruption as the vulnerability can be leveraged to achieve remote code execution in scenarios where FFmpeg is used in server-side applications or processing untrusted media files from external sources.
The implications of CVE-2020-22016 are particularly concerning given FFmpeg's widespread adoption across numerous applications and platforms that handle multimedia content. Systems utilizing FFmpeg for video processing, streaming services, content management systems, and media editing software become vulnerable to exploitation. Attackers can craft malicious .mov files that, when processed by vulnerable FFmpeg versions, trigger the buffer overflow condition. This vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter, as successful exploitation could enable attackers to execute arbitrary commands on affected systems. The attack surface is broad since FFmpeg is integrated into countless applications including web browsers, media players, content delivery networks, and various enterprise multimedia processing platforms.
Mitigation strategies for this vulnerability primarily focus on immediate software updates and patches provided by FFmpeg maintainers, as version 4.2 contains the flaw that requires remediation through version 4.3 or later releases. Organizations should implement comprehensive patch management procedures to ensure all systems utilizing FFmpeg components receive timely updates. Additionally, input validation measures should be strengthened through proper sanitization of media files before processing, including file format verification and size limitation checks. Network-based mitigations can include content filtering systems that scan for known malicious file patterns and restrict .mov file processing in high-risk environments. Security monitoring should be enhanced to detect unusual memory allocation patterns or application crashes that might indicate exploitation attempts, with intrusion detection systems configured to alert on suspicious FFmpeg behavior. The vulnerability also underscores the importance of secure coding practices in multimedia processing libraries, emphasizing the need for rigorous buffer boundary checking and memory management protocols that align with industry standards for secure software development.