CVE-2020-12391 Explained : Impact and Mitigation

This CVE-2020-12391 article provides insights into a security vulnerability affecting Mozilla Firefox versions below 76, allowing the execution of scripts that should have been blocked.

Understanding CVE-2020-12391

This section delves into the details of the vulnerability and its impact.

What is CVE-2020-12391?

The vulnerability in Firefox versions below 76 enables the execution of scripts that should have been blocked due to a failure in inheriting the Content Security Policy (CSP) of the creating context.

The Impact of CVE-2020-12391

The vulnerability allows the execution of scripts that should have been blocked, albeit with a unique opaque origin, potentially leading to security breaches and unauthorized script execution.

Technical Details of CVE-2020-12391

Explore the technical aspects of the vulnerability.

Vulnerability Description

Documents created using data: URLs in an OBJECT element fail to inherit the CSP of the creating context, enabling the execution of scripts that should have been blocked.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 76

Exploitation Mechanism

The vulnerability bypasses the Content Security Policy (CSP) using object elements, allowing the execution of scripts that should have been blocked.

Mitigation and Prevention

Learn how to mitigate and prevent exploitation of this vulnerability.

Immediate Steps to Take

Update Firefox to version 76 or higher to patch the vulnerability.
Avoid visiting untrusted websites or clicking on suspicious links.

Long-Term Security Practices

Regularly update your browser and other software to the latest versions.
Implement a robust CSP to mitigate similar security risks.

Patching and Updates

Stay informed about security advisories from Mozilla and apply patches promptly to secure your system.