Date: Mon, 25 Jun 2012 17:58:50 -0700 From: Doug Barton <dougb@FreeBSD.org> To: RW <rwmaillists@googlemail.com> Cc: freebsd-security@freebsd.org Subject: Re: Hardware potential to duplicate existing host keys... RSA DSA ECDSA was Add rc.conf variables... Message-ID: <4FE9094A.4080605@FreeBSD.org> In-Reply-To: <20120626015323.02b7f348@gumby.homeunix.com> References: <CA%2BQLa9A4gdgPEn3YBpExTG05e4mqbgxr2kJ16BQ27OSozVmmwQ@mail.gmail.com> <86zk7sxvc3.fsf@ds4.des.no> <CA%2BQLa9Dyu96AxmCNLcU8n5R21aTH6dStDT004iA516EH=jTkvQ@mail.gmail.com> <20120625023104.2a0c7627@gumby.homeunix.com> <86pq8nxtjp.fsf@ds4.des.no> <20120625223807.4dbeb91d@gumby.homeunix.com> <4FE8DF29.50406@FreeBSD.org> <20120625235310.3eed966e@gumby.homeunix.com> <4FE8F814.5020906@FreeBSD.org> <20120626015323.02b7f348@gumby.homeunix.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 06/25/2012 17:53, RW wrote: > On Mon, 25 Jun 2012 16:45:24 -0700 > Doug Barton wrote: > >> On 06/25/2012 15:53, RW wrote: >>> On Mon, 25 Jun 2012 14:59:05 -0700 >>> Doug Barton wrote: >>> >>>>>> Having a copy of the host key allows you to do one thing and one >>>>>> thing only: impersonate the server. It does not allow you to >>>>>> eavesdrop on an already-established connection. >>>>> >>>>> It enables you to eavesdrop on new connections, >>>> >>>> Can you describe the mechanism used to do this? >>> >>> Through a MITM attack if nothing else >> >> Sorry, I wasn't clear. Please describe, in precise, reproducible >> terms, how one would accomplish this. Or, link to known script-kiddie >> resources ... whatever. My point being, I'm pretty confident that >> what you're asserting isn't true. But if I'm wrong, I'd like to learn >> why. > > Servers don't always require client keys for authentication. If they > don't then a MITM attack only needs the server's key. Once again, please describe *how* the MITM is accomplished. If you can't, then please stop posting on this topic. My point is that the ssh protocol is designed specifically to prevent what you're describing. Doug -- This .signature sanitized for your protection
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4FE9094A.4080605>