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in ASP.NET. This vulnerability exists in all versions of ASP.NET. This vulnerability was publically disclosed late Friday at a security conference. We recommend asp net web api security that all customers immediately apply a workaround (described below) to prevent attackers asp net cookie secure from using this vulnerability against your ASP.NET applications. Important Update: You can now download the official security how to secure web.config file in asp net patch update here. Please install it ASAP on your servers – it is the only way to protect against the vulnerability. You should no longer rely on the below https://support.microsoft.com/en-us/kb/320268 workaround and instead install the official security patch update immediately to protect yourself. What does the vulnerability enable? An attacker using this vulnerability can request and download files within an ASP.NET Application like the web.config file (which often contains sensitive data). At attacker exploiting this vulnerability can also decrypt data sent to the client in an encrypted state (like http://weblogs.asp.net/scottgu/important-asp-net-security-vulnerability ViewState data within a page). How the Vulnerability Works To understand how this vulnerability works, you need to know about cryptographic oracles. An oracle in the context of cryptography is a system which provides hints as you ask it questions. In this case, there is a vulnerability in ASP.NET which acts as a padding oracle. This allows an attacker to send cipher text to the web server and learn if it was decrypted properly by examining which error code was returned by the web server. By making many such requests (and watching what errors are returned) the attacker can learn enough to successfully decrypt the rest of the cipher text. How to Workaround The Vulnerability A workaround you can use to prevent this vulnerability is to enable the
ASP.NET > Article Reported Service Interruptions Resolving ASP.NET Errors If you are frequently recieving errors using ASP.NET, use the insturctions below http://help.1and1.com/hosting-c37630/scripts-and-programming-languages-c85099/aspnet-c39624/resolving-aspnet-errors-a617716.html to resolve the error that applies to you. RESTRICTIONS THROUGH CODE ACCESS SECURITY In a shared hosting environment ASP.NET has been restricted for security reasons to prevent malicious customers spying and manipulating others and their data. These restrictions are based on the .NET feature "Code Access Security" (CAS). In dedicated hosting (e.g. 1&1 Windows asp net Server) these restrictions are not necessary, whereby ASP.NET Code can work with so called FullTrust. CAS will grant access to only critical resources that hold particular CAS permissions. In shared hosting the following permissions will be given: DnsPermission to perform DNS queries. FileIOPermission to read and write files within application directory. ReflectionPermission to reflect public asp net security members of a type, with "NoFlags" SecurityPermission with Execution, ControlThread and ControlPrincipal SqlClientPermission to access SQL Server using classes of System.Data.SqlClient WebPermission to perform HTTP requests, e.g. to use external XML Web Services. (The access must be done using a proxy server ntproxyus.lxa.perfora.net on port 3128) If ASP.NET code tries to access restricted resources or to use restricted functions that require more than the given permissions, an Exception will be raised. In order to receive a detailed error message it may be necessary to set the option "CustomErrors" value to "Off" in "web.config". Also with detailed error messages it is sometimes not obvious what the real cause is or what changes are required. In any case a CAS error message will be raised as "SecurityException: The application attempted to perform an operation not allowed by the security policy.". The item "Exception Details" will normally refer to the missing permission: "Request for the permission of type XYZ failed". The item "Stack Tra