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Many developers are doubtful about using the view state specifically because it is stored in a hidden field and left on the client at the mercy of potential intruders. Although the data is stored in a hashed format, there s no absolute guarantee that it cannot be tampered with. The first comment I d like to make in response to this is that the view state as implemented in ASP.NET is inherently more secure than any other hidden fields you might use (and that you were likely using, say, in old classic ASP applications). My second remark is that only data confidentiality is at risk. While this is a problem, it is minor compared to code injection. Freely accessible in a hidden field named __VIEWSTATE, the view state information is, by default, hashed and Base64 encoded. To decode it on the client, a potential attacker must accomplish a number of steps, but the action is definitely possible. Once decoded, though, the view state reveals only its contents that is, confidentiality is at risk. However, there s no way an attacker can modify the view state to post malicious data. A tampered view state, in fact, is normally detected on the server and an exception is thrown. For performance reasons, the view state is not encrypted. If it s needed, though, you can turn the option on by acting on the web.config file, as follows:
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<machineKey validation="3DES" />
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When the validation attribute is set to 3DES, the view-state validation technique uses 3DES encryption and doesn t hash the contents. If you use web.config, the settings apply to all pages in the application. You can also control encryption settings separately for each page.
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17 ASP.NET State Management
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Furthermore, individual controls on the page can request to encrypt the view state. In case of a conflict, page settings win. You use the ViewStateEncryptionMode property, which accepts values from the ViewStateEncryptionMode enumeration. Feasible values are Auto, Always, and Never. The default value is Auto. When the value is Auto, ASP.NET encrypts the entire view state only if all controls want it encrypted. With values like Always and Never, the view state is always or never encrypted, regardless of the control settings.
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The @Page directive contains an attribute named EnableViewStateMac, whose only purpose is making the view state a bit more secure by detecting any possible attempt at corrupting the original data. When serialized, and if EnableViewStateMac is set to true, the view state is appended with a validator hash string based on the algorithm and the key defined in the <machineKey> section of the configuration file. The resulting array of bytes, which is the output of the StateBag s binary serialization plus the hash value, is Base64 encoded. By default, the encryption algorithm to calculate the hash is SHA1, and the encryption and decryption keys are autogenerated and stored in the Web server machine s Local Security Authority (LSA) subsystem. The LSA is a protected component of Windows. It provides security services and maintains information about all aspects of local security on a system. If EnableViewStateMac is true, when the page posts back, the hash value is extracted and used to verify that the returned view state has not been tampered with on the client. If it has been, an exception is thrown. The net effect is that you might be able to read the contents of the view state, but to replace it you need the encryption key, which is in the Web server s LSA. The MAC in the name of the EnableViewStateMac property stands for Machine Authentication Check, which is enabled by default. If you disable the attribute, an attacker could alter the view-state information on the client and send a modified version to the server and have ASP.NET blissfully use that tampered-with information. To reinforce the security of the view state, you can use the ViewStateUserKey property. The property evaluates to a user-specific string (typically, the session ID) that is known on the server and hard to guess on the client. ASP.NET uses the content of the property as an input argument to the hash algorithm that generates the MAC code.
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