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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | icedove | 31.4.0-1~deb7u1 | DSA-3132-1 |
| Debian 7 | iceweasel | 31.4.0esr-1~deb7u1 | DSA-3127-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | firefox | 35.0+build3-0ubuntu0.14.04.2 | USN-2458-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:31.4.0+build1-0ubuntu0.14.04.1 | USN-2460-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox +2 | 31.4.0-1.el7_0 | RHSA-2015:0046 |
| RHEL 6 | firefox +1 | 31.4.0-1.el6_6 | RHSA-2015:0047, RHSA-2015:0046 |
| RHEL 5 | firefox +1 | 31.4.0-1.el5_11 | RHSA-2015:0047, RHSA-2015:0046 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Productivity 5 | thunderbird | 31.4.0-1.el5_11 | RHSA-2015:0047 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 45.5.1-1.1 | openSUSE-SU-2024:10230-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox +2 | 31.4.0-1.0.1.el7_0 | ELSA-2015-0046 |
Advisories 10
- RHSA-2015:0046 Red Hat Security Advisory: firefox security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2015:0047 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-2460-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-2458-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3127-1 iceweasel - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3132-1 icedove - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10230-1 MozillaThunderbird-45.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2015-0046 Critical: firefox security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 14, 2015
References
- RHSA-2015:0046 vendor-advisory
- 62242 third-party-advisory
- 1031533 vdb-entry
- USN-2460-1 vendor-advisory
- openSUSE-SU-2015:0192 vendor-advisory
- 62304 third-party-advisory
- http://linux.oracle.com/errata/ELSA-2015-0047.html
- 62259 third-party-advisory
- 62250 third-party-advisory
- SUSE-SU-2015:0173 vendor-advisory
- 62237 third-party-advisory
- openSUSE-SU-2015:0077 vendor-advisory
- 62418 third-party-advisory
- SUSE-SU-2015:0171 vendor-advisory
- 62316 third-party-advisory
- DSA-3132 vendor-advisory
- 62274 third-party-advisory
- firefox-cve20148639-session-hijacking(99959) vdb-entry
- GLSA-201504-01 vendor-advisory
- 62313 third-party-advisory
- RHSA-2015:0047 vendor-advisory
- 62790 third-party-advisory
- 62293 third-party-advisory
- 62283 third-party-advisory
- 62446 third-party-advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
- 62657 third-party-advisory
- 62273 third-party-advisory
- http://www.mozilla.org/security/announce/2014/mfsa2015-04.html
- openSUSE-SU-2015:0133 vendor-advisory
- openSUSE-SU-2015:1266 vendor-advisory
- DSA-3127 vendor-advisory
- SUSE-SU-2015:0180 vendor-advisory
- 62315 third-party-advisory
- http://linux.oracle.com/errata/ELSA-2015-0046.html
- 62253 third-party-advisory
- 1031534 vdb-entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1095859
- 72046 vdb-entry