CVE-2018-6089 : Exploit Details and Defense Strategies

A vulnerability in Google Chrome prior to version 66.0.3359.117 allowed remote attackers to extract cross-origin data through a crafted HTML page.

Understanding CVE-2018-6089

In versions of Google Chrome before 66.0.3359.117, a vulnerability was identified in the Service Worker feature due to insufficient policy enforcement.

What is CVE-2018-6089?

This vulnerability in Google Chrome allowed malicious actors to exploit a lack of Cross-Origin Resource Sharing (CORS) checks, enabling the extraction of limited cross-origin data through a specially crafted HTML page.

The Impact of CVE-2018-6089

The vulnerability could be exploited by remote attackers to leak cross-origin data, potentially leading to unauthorized access to sensitive information.

Technical Details of CVE-2018-6089

Vulnerability Description

A lack of CORS checks in Google Chrome's Service Worker feature allowed attackers to leak limited cross-origin data when redirecting to a cross-origin PDF.

Affected Systems and Versions

Product: Chrome
Vendor: Google
Versions Affected: < 66.0.3359.117

Exploitation Mechanism

Attackers could exploit this vulnerability by using a specifically crafted HTML page to extract a limited amount of cross-origin data.

Mitigation and Prevention

Immediate Steps to Take

Update Google Chrome to version 66.0.3359.117 or later to mitigate the vulnerability.
Be cautious while accessing unknown or untrusted websites to prevent potential exploitation.

Long-Term Security Practices

Regularly update browsers and software to the latest versions to patch known vulnerabilities.
Implement strict CORS policies and security measures to prevent unauthorized data access.

Patching and Updates

Google released a stable channel update for desktop to address this vulnerability.