MS10-070  MS10-070 - Important : Vulnerability in ASP.NET Could Allow Information Disclosure (2418042) - Version: 4.2

Version2011-10-26 Severity Rating: Important Revision Note: V4.2 (October 26, 2011): Corrected Server Core installation applicability for .NET Framework 4 on Windows Server 2008 R2 for x64-based Systems. Summary: This security update resolves a publicly disclosed vulnerability in ASP.NET. The vulnerability could allow information disclosure. An attacker who successfully exploited this vulnerability could read data, such as the view state, which was encrypted by the server. This vulnerability can also be used for data tampering, which, if successfully exploited, could be used to decrypt and tamper with the data encrypted by the server. Microsoft .NET Framework versions prior to Microsoft .NET Framework 3.5 Service Pack 1 are not affected by the file content disclosure portion of this vulnerability.
Bulletin details at Microsoft.com