help, i've been spoofed

[farley99]

How did this happen?
# lds102
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The RSA host key for lds102 has changed,
and the key for the according IP address 12.52.58.55
is unchanged. This could either mean that
DNS SPOOFING is happening or the IP address for the host
and its host key have changed at the same time.
Offending key for IP in /root/.ssh/known_hosts:65
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
61:4c:a9:aa:a4:e4:da:8a:f8:f2:0d:bd:9f:ca.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:31
RSA host key for lds102 has changed and you have requested strict checking.
Host key verification failed.

 

[lupidus]

"Read it carefully. It explains very well what is going on. Most likely the server was upgraded and its host key has changed. Make sure that it is the case and then remove all lines mentioning this server from your .ssh/known_host. The new server key will be recorded upon the next login. If you don't verify the reason why the server has a different host key you are in danger of leaking sensitive information to a different host impersonating your server.

An additional problem you may have when you get this message is that you are unable to launch X applications from this ssh session. Fix the host key - it will work then." (

http://darbujan.fzu.cz/~masik/faq-en.phtml)

/Lupidus

 

[santoshdj123]

hi

Ya it is correct. For knowing who or which ip is doing nasty to your server. just check ur packing going outwords and inwards by using the following command
# tcpdump -i eth0
it will show all ips along with the domain names from which they are trying to access ur server.

santosh

 

[clonny2]

if you have a different host key then edit your users .ssh/known_hosts and remove the key for the server trying to access.
This happens to me alot, but I am testing ssh to a server that gets reinstalled over and over. So I have an sed command to remove the entry.


>---------------------------------------Lawrence Feldman
SR. QA. Engineer SNAP Appliance
lfeldman@snapappliance.com