CVE-2018-5118 : Security Advisory and Response

Firefox prior to version 58 is vulnerable to a security issue where the Activity Stream page could potentially expose local data. Learn about the impact, technical details, and mitigation steps.

Understanding CVE-2018-5118

The vulnerability in Firefox could allow the loading of local content through file URLs, posing a risk of data exposure.

What is CVE-2018-5118?

The Activity Stream page in Firefox, used when opening a new tab, could generate screenshot images using meta tags from websites. However, a flaw allowed the page to potentially use 'file:' URLs from the local file system, risking local data exposure.

The Impact of CVE-2018-5118

The vulnerability in Firefox versions prior to 58 could lead to local data exposure if combined with an attack that bypasses sandbox protections.

Technical Details of CVE-2018-5118

Firefox's vulnerability lies in the way the Activity Stream page handles image generation.

Vulnerability Description

The issue arises from the page's ability to create screenshot images using 'file:' URLs from the local file system, potentially exposing local data.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Affected Versions: < 58

Exploitation Mechanism

The vulnerability allows the Activity Stream page to load local content through 'file:' URLs, which could lead to data exposure.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are crucial to safeguard against CVE-2018-5118.

Immediate Steps to Take

Update Firefox to version 58 or above to mitigate the vulnerability.
Avoid opening potentially malicious websites or links.

Long-Term Security Practices

Regularly update browsers and software to the latest versions.
Implement robust sandboxing mechanisms to prevent data exposure.

Patching and Updates

Ensure timely installation of security patches and updates provided by Mozilla to address CVE-2018-5118.