CVE-2018-12403 : Security Advisory and Response

A vulnerability in Firefox versions older than 63 allows loading a favicon over an insecure HTTP connection without displaying a mixed content warning.

Understanding CVE-2018-12403

This CVE entry highlights a specific issue in Firefox that affects the display of mixed content warnings when loading favicons over HTTP connections.

What is CVE-2018-12403?

This vulnerability in Firefox versions prior to 63 prevents users from receiving a mixed content warning when a website is loaded securely over HTTPS but the favicon resource is loaded insecurely over HTTP.

The Impact of CVE-2018-12403

The vulnerability poses a security risk as users may not be alerted to potential mixed content issues, potentially exposing them to security threats.

Technical Details of CVE-2018-12403

This section delves into the technical aspects of the CVE, including the description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability allows websites to load favicons over HTTP without triggering a mixed content warning, impacting Firefox versions older than 63.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 63

Exploitation Mechanism

The exploit involves loading a favicon over an insecure HTTP connection while the main site is loaded securely over HTTPS, bypassing the mixed content warning.

Mitigation and Prevention

To address CVE-2018-12403, users and organizations should take immediate and long-term security measures.

Immediate Steps to Take

Update Firefox to version 63 or newer to mitigate the vulnerability.
Avoid visiting websites with insecure HTTP connections to prevent exploitation.

Long-Term Security Practices

Regularly update browsers and software to the latest versions.
Educate users on the risks of mixed content and encourage secure browsing habits.

Patching and Updates

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