extras/curltest.php in Zen Cart 1.3.8 and 1.3.8a, and possibly other versions, allows remote attackers to read arbitrary files via a file:// URI. NOTE: some of these details are obtained from third party information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/54687
http://www.zen-cart.com/forum/showthread.php?t=142784
http://www.vupen.com/english/advisories/2009/3474
http://www.securityfocus.com/bid/37283
http://www.securityfocus.com/archive/1/508340/100/0/threaded