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while playing around I had an idea for some "new kind of mitm" which works quite well here. Affected: All operating systems with unused IPv6 capabilities listening to router advertisements (radvd for example) Attack: Have an IPv6 tunnel with appropriate prefix delegated. Configure your machine to propagate the prefix and switch on IPv6 routing.
As soon as the "victim" has an IPv6 address issued by your radvd it will prefer AAAA-entries over A-entries and connect via your tunnel where you're waiting with a password sniffer of your choice ;).
This works in any computing center where you have colo'ed you box, have a dedicated system or...simply physical access. During my proof-of-concept I was able to intercept SMTP, HTTP and DNS sessions. It should also work in LANs (lanparties, corporations). The "danger" of misled connections will dramatically increase with the increasing amount of ISPs also offering services usable via IPv6. Advisory: Turn off your sever's/client's entire IPv6 capability or at least the capability to catch up router advertisement messages
I hope you find the contents of my mail useful, entertaining or at least noch entirely shitty.