Full Disclosure mailing list archives
Re: targetted SSH bruteforce attacks
From: Michael Holstein <michael.holstein () csuohio edu>
Date: Thu, 17 Jun 2010 10:56:18 -0400
Is anyone else seeing this type of attack? Or is someone really targeting MY box?
No, I assure you it's not just you. It's also not uncommon to see a sequential (basically a nmap -p 22) scan at full throttle several times a day. You can basically : a) move to another port (obscurity .. but pretty effective in weeding out the casual versus committed) b) switch to public key only auth (recommended anyway if possible). c) use denyhosts, tarpitting, etc. to frustrate the casual guessers and bots. The ones that are committed will find a way around (a) and (c). But it will take somebody a long time to properly guess a key for (b) .. unless you forgot to patch your Debian SSHd from their little snafu .. but you'd have been owned long ago if that was the case. If you really must use passwords on a multi-user system listening on tcp/22, then employ something like the PAM modules for JTR (/pam_passwdqc) /just to make sure people don't use stupid ones. Cheers, Michael Holstein Cleveland State University _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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- targetted SSH bruteforce attacks Gary Baribault (Jun 17)
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