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ViewState MAC Disabled

Severity: Medium
Summary#

Invicti detected that MAC validation is disabled in ViewState data.

Impact#
An attacker can tamper with the application's state variables located in the ViewState data structure.
Actions To Take#
  1. For page-based protection, place the following directive at the top of affected page.
    <%@Page EnableViewStateMAC=true %>
  2. You can also set this option for the whole application by using web.config files. Apply the following configuration for your application's web.config file.
    <System.Web>
    <pages enableViewStateMac="true">
</System.Web>
Remediation#
ASP.NET uses a hash code-based integrity solution called "ViewStateMac" to protect ViewState parameters against tampering attacks. You can implement this solution on a page or application level.
Classifications#
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