boot force attack help

Charles Curley charlescurley at
Fri Jul 29 19:39:45 MDT 2005

On Mon, Jul 25, 2005 at 08:36:21PM -0700, Chris Carey wrote:
> One thing I noticed with Redhat 9, Redhat 10 was that
> the default sshd_config was set to downgrade to SSHv1
> if SSHv2 fails
> In Redhat sshd_config it says:
> Protocol 2,1
> I ask the group - Is this still the case with current
> Fedoras? Please check your config file.
> This setting allows the machine to be compromised with
> MITM attack. The ssh server can be forced to use SSH1
> instead of SSH2 and then compromised using faults in
> SSH1. The username/password can be seen as well as the
> session. ettercap is one of the tools that can do
> this.
> For better safety, the setting should be:
> Protocol 2

I just checked a freshly minted FC4 installation, and that is what
both the ssh and sshd config file specify.


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