ASPNet Validation Key detected in code

Rule Details

Cortex AppSec Rule ID	APPSEC_SECRET_276
Category	Secrets
Severity	MEDIUM
Framework	Git

Impact

The ASPNet Validation Key is a confidential cryptographic key used for generating the Message Authentication Code (MAC).

Exposure is a Critical Risk that exposes the application to ViewState tampering attacks, potentially leading to deserialization attack and Remote Code Execution (RCE).

How to Fix

To remediate a generic or high-entropy secret:

1. Identify the service or resource protected by this secret (investigate variable names or surrounding code for context).
2. Log in to the identified service and rotate the credentials.
3. If the service cannot be identified, treat the secret as critical: check if it matches internal passwords or keys and rotate them as a precaution.
4. Update your application configuration with the new value.

Next, remove the secret from your codebase:

1. Locate the exposed string in your codebase.
2. Remove it or replace it with a secure variable or reference.

Finally, clean your version control history:

1. Permanently remove the sensitive data from your version control history to ensure it cannot be retrieved.