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Take it as a lesson and restore from a backup, you got those right? If not get a system administrator to perform backups daily.
Hard to find someone you don't know who your looking for or know where they live, and if they are out of your country... Good luck.
Secondly if I were to deface a page and put a link to my website I would not put my real registration information in the whois. What happens when you call the person(s) number listed in the whois db? If you wanted to, you could contact the registrar once you find out its invalid information and have the domain revoked but that takes some time.
Thirdly, if you have all this information you should report it to your local authorities to further investigate.
Fourth, I'd spend the time on making the website secure vs trying to stop someone who probably did a google query for the software and insecure version number to find your site.
I have his IP number, his real name, his county in CA, and his email address and website.
But more importantly you have a website that you need to secure, right?
Perhaps the guy has done you a favour by highlighting a hole.
Move on, rise above it and spend your time doing constructive things. A tit for tat exchange is only going to escalate the problem, and by the sounds of it, he's more savvy on your forum engine that you might be, so I wouldn't go picking a fight with him.
A friendly email to him might prove more valuable in the long run.
TJ
How can we make sure that he pays the maximum price for his crime?
>>> Does he know he's messing with the Borg?
Have you tried assimilation?
Seriously; as has been pointed out; there is a lesson to be learnt in all of this - a hard lesson, but a good one. Now you know to take even greater care in future.
Syzygy
My fault really. I never kept up to date with the security. ;oP
Lesson Learnt.
Keep your security patches up to date. It is so easy, if you can spot an unpatched board, to exploit vulnerabilities. Even my cat could do it.
I hope, unlike me, that you have kept daily backups of your database.
Ska