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CVE-2016-5284

7.4 · HIGH

Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 rely on unintended expiration dates for Preloaded Public Key Pinning, which allows man-in-the-middle attackers to s…

Published Sep 22, 2016CWE-20EPSS 2.37%

Overview

CVE-2016-5284 is a high-severity vulnerability. It was published on September 22, 2016 and has a CVSS 3.0 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 rely on unintended expiration dates for Preloaded Public Key Pinning, which allows man-in-the-middle attackers to spoof add-on updates by leveraging possession of an X.509 server certificate for addons.mozilla.org signed by an arbitrary built-in Certification Authority.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refrhn.redhat.com/errata/RHSA-2016-1912.htmlRefseclists.org/dailydave/2016/q3/51Refwww.debian.org/security/2016/dsa-3674Refwww.mozilla.org/security/announce/2016/mfsa2016-85.htmlRefwww.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.htmlRefwww.securityfocus.com/bid/93049Refwww.securitytracker.com/id/1036852Refblog.mozilla.org/security/2016/09/16/update-on-add-on-pinning-vulnerability/Refbugzilla.mozilla.org/show_bug.cgi?id=1303127Refhackernoon.com/tor-browser-exposed-anti-privacy-implantation-at-mass-scale-bd68e9eb1e95

How CyberStrike helps

Frequently asked questions

What is CVE-2016-5284?

CVE-2016-5284 is a high-severity vulnerability. It was published on September 22, 2016 and has a CVSS 3.0 base score of 7.4 (HIGH).

How severe is CVE-2016-5284?

This vulnerability has a CVSS 3.0 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-5284?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-5284?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-5284 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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