Open redirect vulnerability in Siemens WinCC (TIA Portal) 11 and 12 before 12 SP1 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks by leveraging improper configuration of SIMATIC HMI panels by the WinCC product.
https://ics-cert.us-cert.gov/advisories/ICSA-13-213-02
https://exchange.xforce.ibmcloud.com/vulnerabilities/86100
http://www.securityfocus.com/bid/61535
http://secunia.com/advisories/54252
http://secunia.com/advisories/54051
http://scadastrangelove.blogspot.com/2013/08/ssa-064884-wincctia-portal-fixes.html