Citrix Access Gateway Advanced Edition before firmware 4.5.5 allows attackers to redirect users to arbitrary web sites and conduct phishing attacks via unknown vectors.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35512
http://www.vupen.com/english/advisories/2007/2583
http://www.securitytracker.com/id?1018435
http://www.securityfocus.com/bid/24975
http://support.citrix.com/article/CTX114028
http://support.citrix.com/article/CTX113816