Open redirect vulnerability in the Forms Authentication feature in the ASP.NET subsystem in Microsoft .NET Framework 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a crafted return URL, aka "Insecure Redirect in .NET Form Authentication Vulnerability."
http://jvn.jp/en/jp/JVN71256611/index.html
http://jvndb.jvn.jp/jvndb/JVNDB-2011-003557
http://www.securityfocus.com/bid/51202
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-100
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14815