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Vulnerability Fixation
How To Encrypt Viewstates In Dotnet

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ViewState Encryption (ASP.NET)

ViewState stores page state in a hidden field. Without encryption, attackers can read or analyze ViewState to discover sensitive information or exploit state logic.

Encryption in ASP.NET 2.0+
  • Supports page-by-page ViewState encryption configuration.
  • MachineKey with validation="3DES" encrypts ViewState automatically.
  • Required for Web-Farm environments (consistent MachineKey across servers).
Impact
  • Attackers can view application logic stored in ViewState.
  • If sensitive data is stored, it may be exposed.

How Protection Works

  • Base64 encoding + MAC hash prevents tampering.
  • Encryption prevents viewing hidden ViewState data.
  • Performance impact exists — use only when needed.

Remedy

  • Enable ViewState encryption at page level:
    <%@ Page ViewStateEncryptionMode="Always" %>
  • Enable encryption for entire application via web.config:
    <System.Web>
      <pages viewStateEncryptionMode="Always">
    </System.Web>
  • Use SSL/TLS to protect ViewState in transit.

Additional Security Options

  • Control State Encryption — controls can request ViewState encryption automatically.
  • Per-User ViewState Protection — Set ViewStateUserKey to prevent replay/clickjacking attacks.

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