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Microsoft is investigating a new public report of a vulnerability in ASP.NET. An attacker who exploited this vulnerability could view data, such as the View State, which was encrypted by the target server, or read data from files on the target server, such as web.config. This would allow the attacker to tamper with the contents of the data. By sending back the altered contents to an affected server, the attacker could observe the error codes returned by the server.
Don't return a 200 for a status. Return a 500, with a customized error page. RTFA.
...This additional step can be done at a server-wide level, and should take less than 5 minutes to implement. Importantly, this step does not replace the other steps in the original workaround, rather it should be done in addition to the steps already in it...