Apache Tapestry weak secret key
Description
Apache Tapestry uses a cryptographically signed field named "t:formdata" to store serialized Java objects for Form components. This signature mechanism relies on a secret key (HMAC_PASSPHRASE) to prevent tampering. The application is currently configured with a weak, default, or publicly known secret key, which allows attackers to forge valid signatures and manipulate the serialized data.
Remediation
Replace the weak HMAC_PASSPHRASE with a strong, cryptographically random secret key. Generate a random string of at least 32 characters using a secure random generator and configure it in your Tapestry application:<br/><br/>1. Generate a strong secret key using a cryptographically secure method<br/>2. Update your AppModule.java or application configuration:<br/><pre>public static void contributeApplicationDefaults( MappedConfiguration<String, String> configuration) { configuration.add(SymbolConstants.HMAC_PASSPHRASE, "your-long-random-secret-key-here"); }</pre><br/>3. Ensure the secret key is stored securely (e.g., environment variables, secure configuration management) and never committed to version control<br/>4. Restart the application to apply the changes<br/>5. Rotate this key periodically as part of your security maintenance procedures