CVE-2018-12396 Explained : Impact and Mitigation
Learn about CVE-2018-12396, a flaw in Firefox ESR and Firefox versions allowing WebExtensions to execute content scripts in unauthorized contexts, potentially leading to privilege escalation on websites. Find out how to mitigate and prevent this vulnerability.
A vulnerability in Firefox ESR and Firefox versions allows WebExtensions to execute content scripts in restricted contexts, potentially leading to privilege escalation on websites.
Understanding CVE-2018-12396
What is CVE-2018-12396?
This CVE identifies a flaw in WebExtensions that enables them to run content scripts in unauthorized contexts, potentially granting elevated privileges on websites where such scripts should not be executed.
The Impact of CVE-2018-12396
This vulnerability affects Firefox ESR versions prior to 60.3 and Firefox versions before 63, allowing malicious WebExtensions to gain higher privileges than intended.
Technical Details of CVE-2018-12396
Vulnerability Description
The flaw permits WebExtensions to execute content scripts in restricted contexts, leading to potential privilege escalation on websites.
Affected Systems and Versions
- Product: Firefox ESR
- Vendor: Mozilla
- Versions Affected: < 60.3
- Product: Firefox
- Vendor: Mozilla
- Versions Affected: < 63
Exploitation Mechanism
The vulnerability allows WebExtensions to run content scripts in contexts where they should not have access, potentially leading to unauthorized privilege escalation.
Mitigation and Prevention
Immediate Steps to Take
- Update Firefox ESR to version 60.3 or newer.
- Update Firefox to version 63 or newer.
- Disable or remove any suspicious or unnecessary WebExtensions.
Long-Term Security Practices
- Regularly update browsers and WebExtensions to the latest versions.
- Be cautious when installing new WebExtensions and only use trusted sources.
Patching and Updates
Apply security patches and updates provided by Mozilla to address this vulnerability.