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.
linux.oracle.com/errata/ELSA-2015-0046.html
linux.oracle.com/errata/ELSA-2015-0047.html
lists.opensuse.org/opensuse-security-announce/2015-01/msg00014.html
lists.opensuse.org/opensuse-security-announce/2015-01/msg00032.html
lists.opensuse.org/opensuse-security-announce/2015-01/msg00033.html
lists.opensuse.org/opensuse-security-announce/2015-01/msg00036.html
lists.opensuse.org/opensuse-security-announce/2015-02/msg00002.html
lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html
lists.opensuse.org/opensuse-updates/2015-01/msg00071.html
rhn.redhat.com/errata/RHSA-2015-0046.html
rhn.redhat.com/errata/RHSA-2015-0047.html
secunia.com/advisories/62237
secunia.com/advisories/62242
secunia.com/advisories/62250
secunia.com/advisories/62253
secunia.com/advisories/62259
secunia.com/advisories/62273
secunia.com/advisories/62274
secunia.com/advisories/62283
secunia.com/advisories/62293
secunia.com/advisories/62304
secunia.com/advisories/62313
secunia.com/advisories/62315
secunia.com/advisories/62316
secunia.com/advisories/62418
secunia.com/advisories/62446
secunia.com/advisories/62657
secunia.com/advisories/62790
www.debian.org/security/2015/dsa-3127
www.debian.org/security/2015/dsa-3132
www.mozilla.org/security/announce/2014/mfsa2015-04.html
www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
www.securityfocus.com/bid/72046
www.securitytracker.com/id/1031533
www.securitytracker.com/id/1031534
www.ubuntu.com/usn/USN-2460-1
bugzilla.mozilla.org/show_bug.cgi?id=1095859
exchange.xforce.ibmcloud.com/vulnerabilities/99959
security.gentoo.org/glsa/201504-01