CVE-2018-12397 : Vulnerability Insights and Analysis
Learn about CVE-2018-12397 where WebExtensions in Firefox ESR < 60.3 and Firefox < 63 can access local files without user consent, potentially leading to unauthorized data access. Find mitigation steps here.
Extensions developed with WebExtension technology in Firefox ESR versions prior to 60.3 and Firefox versions below 63 can access local files without triggering permission alerts, potentially leading to unauthorized data access.
Understanding CVE-2018-12397
Extensions using WebExtension technology can bypass permission alerts when accessing local files, allowing content scripts to run on local pages without user consent.
What is CVE-2018-12397?
This CVE highlights a vulnerability where WebExtensions can access local files without displaying the typical warning prompt to users, potentially leading to unauthorized data access.
The Impact of CVE-2018-12397
The vulnerability allows extensions to execute content scripts on local pages without permission alerts, potentially leading to unauthorized access to sensitive data stored in local files.
Technical Details of CVE-2018-12397
WebExtensions in Firefox ESR versions prior to 60.3 and Firefox versions below 63 are affected by this vulnerability.
Vulnerability Description
WebExtensions can request access to local files without triggering the warning prompt, enabling them to run content scripts on local pages without user permission.
Affected Systems and Versions
- Firefox ESR versions prior to 60.3
- Firefox versions below 63
Exploitation Mechanism
Extensions using WebExtension technology exploit the lack of warning prompts to access local files and execute content scripts without user consent.
Mitigation and Prevention
To address CVE-2018-12397, follow these steps:
Immediate Steps to Take
- Update Firefox ESR to version 60.3 or higher.
- Update Firefox to version 63 or higher.
- Disable or remove extensions that may pose a security risk.
Long-Term Security Practices
- Regularly update browsers and extensions to the latest versions.
- Be cautious when granting permissions to browser extensions.
Patching and Updates
- Stay informed about security advisories and apply patches promptly to mitigate vulnerabilities.