CVE-2020-35965 : What You Need to Know

FFmpeg 4.3.1's decode_frame in libavcodec/exr.c has an out-of-bounds write due to calculation errors in memset zero operations.

Understanding CVE-2020-35965

This CVE involves a vulnerability in FFmpeg 4.3.1 that can lead to an out-of-bounds write.

What is CVE-2020-35965?

The vulnerability arises from incorrect calculations determining when to execute memset zero operations in FFmpeg 4.3.1's decode_frame in libavcodec/exr.c.

The Impact of CVE-2020-35965

The vulnerability can be exploited to trigger an out-of-bounds write, potentially leading to a denial of service or arbitrary code execution.

Technical Details of CVE-2020-35965

This section delves into the technical aspects of the CVE.

Vulnerability Description

The issue stems from errors in the calculation of when to perform memset zero operations, resulting in an out-of-bounds write in FFmpeg 4.3.1's decode_frame in libavcodec/exr.c.

Affected Systems and Versions

Product: FFmpeg
Version: 4.3.1

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious input to trigger the out-of-bounds write.

Mitigation and Prevention

Protecting systems from CVE-2020-35965 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by FFmpeg promptly.
Monitor security advisories for updates and follow best practices for secure coding.

Long-Term Security Practices

Conduct regular security assessments and code reviews.
Implement secure coding practices and input validation to prevent similar vulnerabilities.

Patching and Updates

Stay informed about security updates from FFmpeg and apply patches as soon as they are released.