CVE-2018-5166 Security feature bypass in Firefox

What is CVE-2018-5166?

CVE-2018-5166 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 11 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

WebExtensions can use request redirection and a "filterReponseData" filter to bypass host permission settings to redirect network traffic and access content from a host for which they do not have explicit user permission. This vulnerability affects Firefox < 60.

Weakness: CWE-269

Which versions are affected by CVE-2018-5166?

It affects 2 products.

Products include Canonical Ubuntu Linux, Mozilla Firefox.

How do I fix CVE-2018-5166?

Upgrade to a fixed version.

Is CVE-2018-5166 being exploited?

There is no known exploitation of CVE-2018-5166 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 GHSA-xf5w-2jf5-86c8, UBUNTU-CVE-2018-5166.