Django before 1.4.18, 1.6.x before 1.6.10, and 1.7.x before 1.7.3 allows remote attackers to spoof WSGI headers by using an _ (underscore) character instead of a - (dash) character in an HTTP header, as demonstrated by an X-Auth_User header.
http://www.ubuntu.com/usn/USN-2469-1
http://www.mandriva.com/security/advisories?name=MDVSA-2015:109
http://www.mandriva.com/security/advisories?name=MDVSA-2015:036
http://secunia.com/advisories/62718
http://secunia.com/advisories/62309
http://secunia.com/advisories/62285
http://lists.opensuse.org/opensuse-updates/2015-09/msg00035.html
http://lists.opensuse.org/opensuse-updates/2015-04/msg00001.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-January/148696.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-January/148608.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-January/148485.html