---
title: "CVE-2014-8639\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2014-8639?format=md
keywords: index, follow
---

# CVE-2014-8639

Publication date 14 January 2015

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

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## Description

Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thunderbird
before 31.4, and SeaMonkey before 2.32 do not properly interpret Set-Cookie
headers within responses that have a 407 (aka Proxy Authentication
Required) status code, which allows remote HTTP proxy servers to conduct
session fixation attacks by providing a cookie name that corresponds to the
session cookie of the origin server.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 14.10 utopic | Fixed 35.0+build3-0ubuntu0.14.10.2 |
| 14.04 LTS trusty | Fixed 35.0+build3-0ubuntu0.14.04.2 |
| 12.04 LTS precise | Fixed 35.0+build3-0ubuntu0.12.04.2 |
| 10.04 LTS lucid | Ignored end of life |
| thunderbird | 14.10 utopic | Fixed 1:31.4.0+build1-0ubuntu0.14.10.1 |
| 14.04 LTS trusty | Fixed 1:31.4.0+build1-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Fixed 1:31.4.0+build1-0ubuntu0.12.04.1 |
| 10.04 LTS lucid | Ignored end of life |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8639)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2014-8639)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2014-8639)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2014-8639)

### Related Ubuntu Security Notices (USN)

+ [USN-2458-1](https://usn.ubuntu.com/USN-2458-1)
+ Firefox vulnerabilities
+ 14 January 2015

+ [USN-2460-1](https://usn.ubuntu.com/USN-2460-1)
+ Thunderbird vulnerabilities
+ 19 January 2015

### Other references

* <https://www.mozilla.org/en-GB/security/advisories/mfsa2015-04/>
* <https://www.cve.org/CVERecord?id=CVE-2014-8639>