CVE-2017-5386 Explained : Impact and Mitigation

WebExtension scripts in Firefox ESR and Firefox versions prior to specified versions could potentially expose data or allow for privilege escalation.

Understanding CVE-2017-5386

WebExtension scripts using the "data:" protocol can impact pages loaded by other extensions, leading to data exposure or privilege escalation.

What is CVE-2017-5386?

This vulnerability affects Firefox ESR versions prior to 45.7 and Firefox versions prior to 51, allowing WebExtension scripts to affect other extensions using the "data:" protocol.

The Impact of CVE-2017-5386

Potential data exposure or privilege escalation in affected extensions.

Technical Details of CVE-2017-5386

WebExtension scripts can utilize the "data:" protocol to affect other extensions, leading to data disclosure or privilege escalation.

Vulnerability Description

WebExtension scripts in Firefox ESR < 45.7 and Firefox < 51 can impact pages loaded by other extensions using the "data:" protocol.

Affected Systems and Versions

Firefox ESR versions prior to 45.7
Firefox versions prior to 51

Exploitation Mechanism

WebExtension scripts exploit the "data:" protocol to interact with pages loaded by other extensions, potentially compromising data or privileges.

Mitigation and Prevention

Immediate Steps to Take

Update Firefox ESR to version 45.7 or later.
Update Firefox to version 51 or later. Long-Term Security Practices
Regularly update browsers and extensions to the latest versions.
Be cautious when installing and enabling browser extensions.
Monitor security advisories for potential vulnerabilities.
Implement secure coding practices.
Consider using security tools to detect malicious activities.
Educate users on safe browsing habits.

Patching and Updates

Apply security patches provided by Mozilla promptly to address vulnerabilities.