Mike Burger wrote:
On Tue, 20 Jun 2006, Bill Tangren wrote:
I have a question regarding ssh on RHEL ES4. The man pages indicates
that Protocol 2,1 is enabled by default. Could someone explain the
logic of this to me? I thought Protocol 1 had a security flaw.
That would cause SSHD to require protocol 2, first, then fall back to
protocol 1 if the client isn't protocol 2 capable.
If you want to restrict sshd to just protocol 2, remove the ",1".
--
Mike Burger
http://www.bubbanfriends.org
From the man page for sshd_config:
**********
Protocol
Specifies the protocol versions ssh supports. The possible values are “1” and
“2”. Multiple versions must be comma-separated. The default is “2,1”. Note
that the order of the protocol list does not indicate preference, because the
client selects among multiple protocol versions offered by the server.
Specifying “2,1” is identical to “1,2”.
**********
This doesn't actually answer my question. If someone *wanted* to exploit the
Protocol 1 vulnerability, wouldn't that be easy? [It is a simple protocol choice
in Putty, for example.]
There must be a reason for allowing this vulnerability by default. I'd like to
know what that reason is.
Thanks for answering, though.
Bill
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