Re: significant incoming SSH volume

[Joel Rosenblatt <joel () COLUMBIA EDU>]

Yes .. we saw 116 addresses doing brute force attacks last night (list attached) .. last number is the count of tries.

For your amusement, I've also included the list of ID's that were tried.

We monitor all logs and look for a successful login from any address that is attacking, that way we know what IDs to 
zap.

Other than that, we ignore them :-)

Thanks,
Joel Rosenblatt

Joel Rosenblatt, Manager Network & Computer Security
Columbia Information Security Office (CISO)
Columbia University, 612 W 115th Street, NY, NY 10025 / 212 854 3033
http://www.columbia.edu/~joel


--On Tuesday, March 16, 2010 4:07 PM -0400 Justin Sipher <jsipher () SKIDMORE EDU> wrote:

> Hello all.  We have seen a drastic uptick in recent days for inbound SSH connections to many of our servers.  These 
> connection are attempting to connect to
> our servers as ROOT and are coming from IP addressed appearing to be mostly overseas.  They number in the thousands of 
> connections.  While we are confident
> in the strength of our passwords, as you know with enough effort.......
>
> My questions to this group are:
>
> Is anyone else seeing this?
>
> Are you doing anything to address this?  We are contemplating blocking SSH inbound on our firewall and requiring any 
> external SSH connection to first connect
> to our VPN.  In some ways it seems excessive and maybe even unsustainable.  On the other hand, protecting our servers 
> is important as you well know.
>
> Any advice, feedback, or suggestion of best practice is welcome.
>
> Best & thanks!
> ...Justin
> ________________________
>   Justin Sipher
>   Chief Technology Officer
>   Skidmore College
>   Saratoga Springs, NY
>   jsipher () skidmore edu
>   518-580-5909



Joel Rosenblatt, Manager Network & Computer Security
Columbia Information Security Office (CISO)
Columbia University, 612 W 115th Street, NY, NY 10025 / 212 854 3033
http://www.columbia.edu/~joel

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