Ssh server key probe check

Hello

I would like to know a reproducible method to check the key of a sensor SSH server from a windows client. I usually use my ssh client like putty, but tried 2 others in this pursuit.

On the sensor, you can use the command 'show ssh server-key' to display the key in its raw format (decimal), but also a MD5 and Bubble Babble fingerprints.

When you connect with PuTTY for the first time, PuTTY shows you a fingerprint, which I suppose is MD5 because it is 128 bits in hexadecimal. But which does not match the footprint of 128 bit hex MD5 shown via command line of the probe.

I tried a 2nd client who gave an imprint babble, but even once, does not match the footprint of chatter that makes the line of command of the probe.

I tried a 3rd customer who shows the MD5 and chatter of fingerprints. These fingerprints match those displayed by the other SSH clients and of course, then no not match what the sensor showed.

Finally, I tried to watch the complete key stored by these clients to host files or the windows registry, to compare with the full key indicated by the line of command IDS. All 3 clients display the key in hexadecimal format, while the sensor displays in decimal format. I can't find a hex to decimal calculator that can handle 1024 bits of an input value!

So if I have to accept blindly to the key the first time my SSH client connects to a Cisco IPS sensor, I am of course open to a man in the middle attack initially connect. I can do some checks warm & fuzzy (connect from the subnet of the probe & check my ARP cache entry MAC address is correct, etc.), but it seems that these fingerprints must be verifiable directly.

Thank you

KEP

This is the kind of a hack which may help.

Once you connect as a service account that you can SSH to the ip address of loopback of the probe.

"ssh-2 127.0.0.1."

-bash - 2.05 b$ ssh-2 127.0.0.1

Could not establish the authenticity of host ' 127.0.0.1 (127.0.0.1).

Of the key DSA is 2 c: 76:a2:b3:67:e2:cb:46:8 d: ee: 3B: 41:92:ac:61:19.

Are you sure you want to continue connecting (yes/no)?

The service account to connect through the ip address of loopback of the probe, so there almost know possibility of a man in the middle attack.

(The only way to spoil it would be for the attacker to have a complete control sensor and charge its own program of SSH server on the sensor)

The "-2" specifies to use a LDAP version 2 client.

Now the big question will be the hexagonal footprint seen in the above question can be used to compare the information provided by your SSH client?

Let me know if this weird method still does not work for you.

I sent an email to our main engineer of SSH to see if there is a better method.

Tags: Cisco Security

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