CVE-2016-5284
Publication date 22 September 2016
Last updated 25 August 2025
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| firefox | ||
| 16.04 LTS xenial |
Fixed 49.0+build4-0ubuntu0.16.04.1
|
|
| 14.04 LTS trusty |
Fixed 49.0+build4-0ubuntu0.14.04.1
|
|
| thunderbird | ||
| 16.04 LTS xenial |
Fixed 1:45.4.0+build1-0ubuntu0.16.04.1
|
|
| 14.04 LTS trusty |
Fixed 1:45.4.0+build1-0ubuntu0.14.04.1
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.4 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-3076-1
- Firefox vulnerabilities
- 22 September 2016
- USN-3112-1
- Thunderbird vulnerabilities
- 27 October 2016