The dissector-table implementation in epan/packet.c in Wireshark 1.12.x before 1.12.7 mishandles table searches for empty strings, which allows remote attackers to cause a denial of service (application crash) via a crafted packet, related to the (1) dissector_get_string_handle and (2) dissector_get_default_string_handle functions.
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11381
http://www.wireshark.org/security/wnpa-sec-2015-23.html
http://www.securitytracker.com/id/1033272
http://www.securityfocus.com/bid/76384
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
http://www.debian.org/security/2015/dsa-3367
http://lists.opensuse.org/opensuse-updates/2015-10/msg00053.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-September/165509.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168837.html