Microsoft has just released security bulletin MS10-070 with security updates for the issue. The updates are currently on Microsoft Download Center, but will be available through all other channels soon. ScottGu has also blogged some FAQs on this security
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Read the complete post at http://blogs.iis.net/nazim/archive/2010/09/29/security-update-released-for-asp-net-padding-oracle-vulnerability.aspx