Firefox 2.0.0.12 SSL Spoofing and Domain Guessing vulnerabilities

Firefox seems to have trouble with defining the proper hostname when
requesting a ssl connection. I was able to trick Firefox in thinking
the hostname behind the at-sign is legit and the same as the URI that
requested an ssl connection, and this without a warning.

PoC: https://www.gmail.com%C0%AF%C0%AF%C0%C0%80@roguehost.com

You can add as much garbage between .com and the @ sign.

So what else can we do?

PoC:
www.cnn.com%C0%AF%C0%AF%C0%C0%80_at_google
www.gmail.com%C0%AF%C0%AF%C0%C0%80_at_hotmail

ah heck we don't need that at all:
www.gmail.comxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx_at_hotmail

works fine also :)

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Received on Feb 04 2008