Directory traversal vulnerability in YaBB search.pl CGI script allows remote attackers to read arbitrary files via a .. (dot dot) attack in the "catsearch" form field.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2000-1161
http://www.securityfocus.com/bid/1921
http://archives.neohapsis.com/archives/bugtraq/2000-11/0110.html