sshd possible breakin attempt messages
Brad Gilmer
bgilmer at gilmer.org
Mon Feb 6 08:23:11 PST 2006
Hello all,
I guess one of the banes of our existance as Sys Admins is that people are always pounding away at our systems trying to break in. Lately, I have been getting hit with several hundred of the messages below per dayin my security report output...
gilmer.org login failures:
Feb 5 11:18:17 gilmer sshd[78078]: reverse mapping checking getaddrinfo for 206-171-37-232.ded.pacbell.net failed - POSSIBLE BREAKIN ATTEMPT!
Feb 5 11:18:18 gilmer sshd[78080]: reverse mapping checking getaddrinfo for 206-171-37-232.ded.pacbell.net failed - POSSIBLE BREAKIN ATTEMPT!
Feb 5 11:18:20 gilmer sshd[78082]: reverse mapping checking getaddrinfo for 206-171-37-232.ded.pacbell.net failed - POSSIBLE BREAKIN ATTEMPT!
I am running FreeBSD 5.4 RELEASE, and right now this box is not a production machine, but I am going to be taking it live fairly soon. Questions:
1) Is there anything I should be doing to thwart this particular attack?
2) Given that I am on 5.4, should I upgrade my sshd or do anything else at this point to make sure my machine is as secure as possible?
3) (Meta-question) - Should I upgrade to 6.0 before I go live to be sure I am in the best possible security situation going forward? Should I wait until 6.1 for bug fixes (generally I am opposed to n.0 anything).
Thanks
Brad
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