CVE-2020-35964 : Exploit Details and Defense Strategies

FFmpeg 4.3.1 is affected by an out-of-bounds write vulnerability in track_header in libavformat/vividas.c due to incorrect extradata packing.

Understanding CVE-2020-35964

What is CVE-2020-35964?

This CVE identifies a vulnerability in FFmpeg 4.3.1 that allows for an out-of-bounds write due to incorrect extradata packing in track_header within libavformat/vividas.c.

The Impact of CVE-2020-35964

The vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial of service (DoS) on systems running the affected version of FFmpeg.

Technical Details of CVE-2020-35964

Vulnerability Description

The issue arises from incorrect extradata packing in track_header in libavformat/vividas.c, leading to an out-of-bounds write.

Affected Systems and Versions

FFmpeg 4.3.1

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious file or stream that triggers the out-of-bounds write when processed by FFmpeg.

Mitigation and Prevention

Immediate Steps to Take

Update FFmpeg to a patched version that addresses the vulnerability.
Avoid processing untrusted or unknown media files with FFmpeg.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Implement proper input validation and sanitization mechanisms in media processing applications.

Patching and Updates

Apply the security patches provided by FFmpeg to fix the vulnerability and prevent potential exploitation.