ColdFusion 5.0 and earlier on Windows systems allows remote attackers to determine the absolute pathname of .cfm or .dbm files via an HTTP request that contains an MS-DOS device name such as NUL, which leaks the pathname in an error message.
http://www.securityfocus.com/bid/4542
http://www.macromedia.com/v1/handlers/index.cfm?ID=22906
http://www.iss.net/security_center/static/8866.php
http://online.securityfocus.com/archive/1/268263
http://archives.neohapsis.com/archives/vulnwatch/2002-q2/0028.html