Microsoft ASP.NET Information Disclosure Vulnerability (2418042)

This host is missing a critical security update according to Microsoft Bulletin MS10-070.
Successful exploitation could allow remote attackers to decrypt and gain access to potentially sensitive data encrypted by the server or read data from arbitrary files within an ASP.NET application. Obtained information may aid in further attacks. Impact Level: System/Application
Run Windows Update and update the listed hotfixes or download and update mentioned hotfixes in the advisory from the below link,
The flaw is due to an error within ASP.NET in the handling of cryptographic padding when using encryption in CBC mode. This can be exploited to decrypt data via returned error codes from an affected server.
Microsoft ASP.NET 1.0 Microsoft ASP.NET 4.0 Microsoft ASP.NET 3.5.1 Microsoft ASP.NET 1.1 SP1 and prior Microsoft ASP.NET 2.0 SP2 and prior Microsoft ASP.NET 3.5 SP1 and prior