CVE-2021-29974 : Exploit Details and Defense Strategies

This CVE-2021-29974 affects Firefox versions less than 90, allowing users to override HTTP Strict Transport Security (HSTS) errors when network partitioning was enabled. Although the error page allowed the user to override errors on domains with HSTS, network connections were correctly upgraded to HTTPS.

Understanding CVE-2021-29974

This vulnerability in Firefox version < 90 could potentially allow users to bypass HSTS security mechanisms.

What is CVE-2021-29974?

The CVE-2021-29974 vulnerability in Firefox <= 90 enabled users to ignore HSTS errors when network partitioning was active.

The Impact of CVE-2021-29974

By allowing users to override HSTS errors, this vulnerability could expose users to security risks, potentially leading to man-in-the-middle attacks.

Technical Details of CVE-2021-29974

This section provides specific technical details regarding the vulnerability.

Vulnerability Description

The TLS error page in Firefox < 90 permitted users to bypass HSTS errors on domains with HSTS enabled.

Affected Systems and Versions

Mozilla Firefox versions less than 90 are affected by this vulnerability.

Exploitation Mechanism

Users could exploit this vulnerability when network partitioning, such as Enhanced Tracking Protection settings, was active.

Mitigation and Prevention

To safeguard systems from CVE-2021-29974, immediate steps and long-term security practices are recommended.

Immediate Steps to Take

Update Firefox to version 90 or higher to mitigate this vulnerability. Avoid overriding HSTS errors.

Long-Term Security Practices

Regularly update Firefox to the latest version to address security vulnerabilities promptly.

Patching and Updates

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