source: http://www.securityfocus.com/bid/4882/info

Gafware's CFXImage is a custom tag for ColdFusion.

A program included with the CFXImage documentation doesn't properly filter its input. It is reported that a flaw exists in this program that allows a malicious user to read files outside of the permitted directory structure. By using directory traversal sequences (i.e. '/../', '..') or specifying a filename, an attacker can obtain files that may contain potentially sensitive information. 

http://www.server.com/docs/showtemp.cfm?TYPE=JPEG&FILE=c:\boot.ini
http://www.server.com/docs/showtemp.cfm?TYPE=JPEG&FILE=../../../../../../../../../../../../../../../../../../boot.ini

This allows the attacker to view the contents of 'c:\boot.ini'.