CVE-2018-12396 Security feature bypass in Firefox

What is CVE-2018-12396?

CVE-2018-12396 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 28 Feb 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events. This allows for potential privilege escalation by the WebExtension on sites where content scripts should not be run. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

Weakness: CWE-732

Which versions are affected by CVE-2018-12396?

It affects 10 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Mozilla Firefox, Mozilla Firefox Esr, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server and 4 more.

How do I fix CVE-2018-12396?

Upgrade to a fixed version.

Is CVE-2018-12396 being exploited?

There is no known exploitation of CVE-2018-12396 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2018-12396, GHSA-5c59-7337-gvv9, UBUNTU-CVE-2018-12396.