Find-By-Content in Mac OS X 10.0 through 10.0.4 creates world-readable index files named .FBCIndex in every directory, which allows remote attackers to learn the contents of files in web accessible directories.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7103
http://www.securityfocus.com/bid/3325
http://www.kb.cert.org/vuls/id/177243
http://archives.neohapsis.com/archives/bugtraq/2001-09/0085.html