services/go.php in Horde Application Framework 3.0.0 through 3.0.10 and 3.1.0 through 3.1.1 does not properly restrict its image proxy capability, which allows remote attackers to perform "Web tunneling" attacks and use the server as a proxy via (1) http, (2) https, and (3) ftp URL in the url parameter, which is requested from the server.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-3544
http://www.vupen.com/english/advisories/2006/2694
http://www.securityfocus.com/bid/18845
http://www.securityfocus.com/archive/1/439255/100/0/threaded
http://www.novell.com/linux/security/advisories/2006_19_sr.html
http://www.debian.org/security/2007/dsa-1406
http://securitytracker.com/id?1016442
http://securityreason.com/securityalert/1229
http://secunia.com/advisories/27565
http://secunia.com/advisories/21459
http://secunia.com/advisories/20954
http://moritz-naumann.com/adv/0011/hordemulti/0011.txt