On 10/22/07, Anders B Jansson <[EMAIL PROTECTED]> wrote: > [EMAIL PROTECTED] wrote: > > Hi, > > > >> Oct 22 20:36:13 nms sshd[90657]: Failed password for invalid user gopher > >> from 77.46.152.2 port 55120 ssh2 > > > > user/password authentication for SSH? one way of cleaning up your > > logs and killing this type of attack is to reconfigure your OpenSSH > > to only allow key based logins. stopped my 10M+ logfiles straight away > > An even better way is to punt the attackers to a 'silent drop' table in your > firewall. > > Cuts your logs to nothing and keeps the kiddies wasting their time. > > The latest attack surge is either directed or a bit more clever, haven't seen > anything on my random user DSL traps. > -- > // hdw >
I still say to throw them into a TARPIT table and tag their connections to throw them into a nice TCP window size of 0. Currently I lower unknown connections window size to bring them to a crawl while known ranges immediately go through. It's not about blocking all unknown, but about making the process take up more of their resources. A silent drop will take up very little of the worm's time when compared to a tarpit that can eat up minutes(hours if they do not set timeouts) per connection. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
