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.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8639
Reference (s):
- BID:72046
- URL: http://www.securityfocus.com/bid/72046
- http://linux.oracle.com/errata/ELSA-2015-0046.html
- http://linux.oracle.com/errata/ELSA-2015-0047.html
- http://www.mozilla.org/security/announce/2014/mfsa2015-04.html