source: https://www.securityfocus.com/bid/7559/info

IT has been reported that Happymall E-Commerce is prone to a file disclosure vulnerability. The problem occurs due to insufficient sanitization of user-supplied URI parameters. As a result, it may be possible for an attacker to view the contents of sensitive system files. Files viewed in this manner would be accessed with the privileges of the Happymall process. 

http://www.target.org/shop/normal_html.cgi?file=../../../../../../etc/issue%00