Guidance for ASP.NET Developers.
Check for canonicalization issues with ASP.NET.
If you are using the below version of the framework.
APPLIES TO
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• Microsoft ASP.NET (included with the .NET Framework 1.0)
• Microsoft ASP.NET 1.1
• Microsoft .NET Framework 1.0
• Microsoft .NET Framework 1.0 Service Pack 1
• Microsoft .NET Framework 1.0 Service Pack 2
• Microsoft .NET Framework 1.0 Service Pack 3
• Microsoft .NET Framework 1.1
• Microsoft .NET Framework 1.1 Service Pack 1 (SP1)
• Microsoft .NET Framework Software Development Kit 1.0 Service Pack 2
• Microsoft .NET Framework Software Development Kit 1.0 Service Pack 1
• Microsoft .NET Framework Software Development Kit 1.0 Service Pack 2
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Then you better click the link below to see how to patch/fix it.
http://www.microsoft.com/security/incident/aspnet.mspx