images/captcha.php in Raven Web Services RavenNuke 2.30, when register_globals and display_errors are enabled, allows remote attackers to determine the existence of local files by sending requests with full pathnames in the aFonts array parameter, and then observing the error messages, which differ between existing and nonexistent pathnames.
https://www.exploit-db.com/exploits/8068
https://exchange.xforce.ibmcloud.com/vulnerabilities/48983
https://exchange.xforce.ibmcloud.com/vulnerabilities/48792
http://www.securityfocus.com/bid/33787
http://www.securityfocus.com/archive/1/500988/100/0/threaded