Directory traversal vulnerability in Google Mini Search Appliance, and possibly Google Search Appliance, allows remote attackers to determine the existence of arbitrary files via a relative path from a style sheet directory, then comparing the resulting error messages.
http://www.vupen.com/english/advisories/2005/2500
http://www.securityfocus.com/bid/15509
http://www.securityfocus.com/archive/1/417310/30/0/threaded
http://securitytracker.com/id?1015246
http://secunia.com/advisories/17644
http://metasploit.com/research/vulns/google_proxystylesheet/