Black Hat Briefings, Europe 2007 [audio] Presentations From The Security Conference.

"SS7 has been a walled garden for a long time: only big telcwould be interconnected tthe network. Due tderegulation and a push toward all-IP architecture, SS7 is opening up, notably with SIGTRAN (SS7 over IP) and NGN (Next Gen Networks) initiatives. SCTP is the protocol used tcarry all telecom signalling information on IP according tthe SIGTRAN protocol suite. It's the foundation, as TCP is the foundation for the web and email. SCTP is alsused for high-performance clusters, resources pooling and very high-speed file transfer. When you discover open SCTP ports, you discover a secret door tthis walled garden. As a walled garden, the internal security of the SS7 network is not as good as one might expect. SCTPscan is a tool tdexactly just that, and is released as open source. This presentation will explain how SCTPscan manages tscan without being detected by remote application, how discrepancies between RFC and implementation enable us tscan more efficiently and how we manage tscan without even being de