The WebRTC subsystem in Mozilla Firefox before 36.0 recognizes turns: and stuns: URIs but accesses the TURN or STUN server without using TLS, which makes it easier for man-in-the-middle attackers to discover credentials by spoofing a server and completing a brute-force attack within a short time window.
https://security.gentoo.org/glsa/201504-01
https://bugzilla.mozilla.org/show_bug.cgi?id=1098314
http://www.ubuntu.com/usn/USN-2505-1
http://www.securitytracker.com/id/1031791
http://www.securityfocus.com/bid/72743
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.mozilla.org/security/announce/2015/mfsa2015-15.html
http://lists.opensuse.org/opensuse-updates/2015-03/msg00067.html
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00000.html