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Re: Confusion on Protocol Mismatch
From: Ryan Jordan <ryan.jordan () sourcefire com>
Date: Fri, 10 Dec 2010 11:00:36 -0500

I haven't changed it since Snort 2.8.5.3, about a year ago.

James, that's an alert from the SSH preprocessor. It alerts in the
event of non-SSH traffic on an SSH port, or a mismatch where one end
uses SSH-1 and the other end uses SSH-2.

Check the traffic that caused the alert. If it looks like it shouldn't
have alerted, post the section of snort.conf that starts with
"preprocessor ssh:".

-Ryan

On Fri, Dec 10, 2010 at 10:30 AM, Weir, Jason <jason.weir () nhrs org> wrote:
overnight I've seen a bunch of these as well did something change with
128-4?

-J

-----Original Message-----
From: Lay, James [mailto:james.lay () wincofoods com]
Sent: Friday, December 10, 2010 10:22 AM
To: snort-users () lists sourceforge net
Subject: Confusion on Protocol Mismatch

Team,



So…I’m confused on just where this is a protocol mismatch:



12/10-08:16:10.632806  [**] [128:4:1] (spp_ssh) Protocol mismatch [**]
[Priority: 3] {TCP} 10.21.10.101:1180 -> 10.21.10.2:22



Relevant conf entries:



var SSH_SERVERS [10.21.0.9,10.21.10.2,10.21.10.8]

portvar SSH_PORTS 22



Thanks/Danke/Gracias



James Lay

IT Security Analyst

WinCo Foods

208-672-2014 Office

208-559-1855 Cell

650 N Armstrong Pl.

Boise, Idaho 83704



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