Former coworker Sacha Faust has published an entry on how the lack of handling relative urls when implementing URL redirection can lead to open redirector's.
Article: http://blogs.msdn.com/sfaust/archive/2010/03/30/saferedirect.aspx
Be careful of “scheme relative urls” when performing 3xx redirects
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WASC Threat Classification
- Abuse of Functionality
- Application Misconfiguration
- Brute Force Attack
- Content Spoofing
- Credential/Session Prediction
- Denial of Service
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- Remote File Inclusion Attack
- Routing Detour Attack
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- XML Attribute Blowup
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