I just noticed today that in the public html directory of one of my sites are two files of 3.3MB named "core.nnnnnnn" where nnnnnn is a number. I didn't create them. I presume that I can just delete them, but I am wondering how they got there. Has anyone else found such files on their server? Might they have been created by some process of cPanel?
No, I don't. I only use PHP, apart from one Perl script that is used for web-to-email forms. There are a couple of CGI binaries (cgiecho, cgimail) in the cgi-bin directory that are part of the standard setup. I don't knowingly use them, though.
Using my web server logs I think I have tracked it down to a couple of clicks on links that use my PHP/MySQL click counter/redirection script, which returned an error code 500 for some reason. Why I don't know, as the links are perfectly valid, and work now. At least I know how the files got there, even if I don't know why.