source: https://www.securityfocus.com/bid/14369/info

Internet Graphics Server is affected by a directory traversal vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input.

A remote unauthorized user can disclose the contents of arbitrary local files through the use of directory traversal strings '../'. Exploitation of this vulnerability could lead to a loss of confidentiality. 

http://host/htdocs/../../../../../../../../../../../../etc/passwd