The HTTPS fallback implementation in Shell In A Box (aka shellinabox) before 2.19 makes it easier for remote attackers to conduct DNS rebinding attacks via the “/plain” URL.
lists.fedoraproject.org/pipermail/package-announce/2016-January/175117.html
lists.fedoraproject.org/pipermail/package-announce/2016-January/175224.html
www.openwall.com/lists/oss-security/2015/12/02/6
www.openwall.com/lists/oss-security/2015/12/02/7
github.com/shellinabox/shellinabox/issues/355
github.com/shellinabox/shellinabox/releases/tag/v2.19