CVE-2018-5166 Explained : Impact and Mitigation

WebExtensions in Firefox versions prior to 60 are vulnerable to a security issue that allows them to bypass host permission settings and access content without explicit user authorization.

Understanding CVE-2018-5166

WebExtensions in Firefox versions prior to 60 can exploit a filter to redirect network traffic and access content without proper authorization.

What is CVE-2018-5166?

This CVE refers to a vulnerability in Firefox that enables WebExtensions to circumvent host permission settings, potentially leading to unauthorized access to content.

The Impact of CVE-2018-5166

The vulnerability allows malicious WebExtensions to redirect network traffic and access content from hosts without user consent, posing a significant security risk.

Technical Details of CVE-2018-5166

WebExtensions in Firefox versions prior to 60 are susceptible to a bypass in host permission settings.

Vulnerability Description

WebExtensions can abuse a filter to bypass host permission settings, enabling unauthorized access to content.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 60

Exploitation Mechanism

Malicious WebExtensions can use the filterReponseData filter to redirect network traffic and access content without proper authorization.

Mitigation and Prevention

Steps to address and prevent the CVE-2018-5166 vulnerability.

Immediate Steps to Take

Update Firefox to version 60 or above to mitigate the vulnerability.
Disable or remove any suspicious or unnecessary WebExtensions.

Long-Term Security Practices

Regularly update Firefox and WebExtensions to the latest versions.
Be cautious when granting permissions to browser extensions.

Patching and Updates

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