CVE-2021-26567 : Vulnerability Insights and Analysis

A stack-based buffer overflow vulnerability was discovered in faad2 before version 2.2.7.1, allowing local attackers to execute arbitrary code via filename and pathname options.

Understanding CVE-2021-26567

This CVE-2021-26567 vulnerability affects the faad2 container provided by GitHub user knik0. It was made public on February 26, 2021.

What is CVE-2021-26567?

The vulnerability exists in frontend/main.c in the faad2 container, enabling local attackers to execute malicious code using specific filename and pathname configurations.

The Impact of CVE-2021-26567

As a stack-based buffer overflow issue, CVE-2021-26567 poses a severe security risk by allowing attackers to run unauthorized code on affected systems, potentially leading to complete system compromise.

Technical Details of CVE-2021-26567

The technical details of this vulnerability are as follows:

Vulnerability Description

The vulnerability stems from a stack-based buffer overflow in frontend/main.c in faad2 before version 2.2.7.1, enabling attackers to exploit it via filename and pathname options.

Affected Systems and Versions

Systems using faad2 versions prior to 2.2.7.1 are vulnerable to this exploit, specifically affecting the container provided by GitHub user knik0.

Exploitation Mechanism

Attackers can leverage this vulnerability by manipulating filename and pathname parameters to trigger the stack-based buffer overflow, leading to arbitrary code execution.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-26567, users and administrators can take the following immediate steps and implement long-term security practices:

Immediate Steps to Take

Update faad2 to version 2.2.7.1 or later to eliminate the vulnerability.
Monitor for any unusual file or pathname inputs that could potentially exploit this vulnerability.

Long-Term Security Practices

Regularly update software and applications to patch known vulnerabilities promptly.
Conduct security audits and assessments to identify and address weaknesses in the system.

Patching and Updates

Stay informed about security advisories and updates from container providers to ensure the latest patches and security measures are applied timely.