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Re: SSH attacks



At 7:15 PM -0500 11/29/05, Barrett Hartman wrote:
There has been a lot of discussion on this for the past year or so. A couple of things you might want to look at are:

http://www.whitedust.net/article/27/Recent%20SSH%20Brute-Force%20Attacks/

Most of the ssh "probes" we're seeing aren't dictionary attacks. They are just looking for weak, insecure systems where well known accounts have common passwords which we'll presume will then become owned for spamming. Or so the honeypots seem to suggest.


  and http://denyhosts.sourceforge.net/

Deny hosts is a perl script that will interact with TCPWrappers (man tcpd) which is installed by default on OS X and will allow you to block the offending incoming connections on the fly.

Note that inetd hasn't been used in OS X for some time, and that Tiger specifically uses launchd instead of even xinetd.


Other than that have good passwords. You may want to try changing the port SSH listens on.

Obfuscates, but anyone running a port mapper will just try the new port.

If these nuisance probes really bother you, install a bastion host.
--

-dhan

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Dan Shoop                                                   AIM: iWiring
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References: 
 >SSH attacks (From: Bruno Schaeffer <email@hidden>)
 >Re: SSH attacks (From: Barrett Hartman <email@hidden>)



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