Summary:

Sending a specially crafted intent with an invalid/empty extras de.niklasmerz.cordova.biometric.BiometricActivity can cause the app to crash. sending the intent repeatedly can prevent the app using this plugin from working, resulting in a denial of service (DoS) condition.

Impact

A 3rd party app/remote attacker can exploit this vulnerability by sending a malicious intent to the target device, causing the app using this plugin from working to crash or become unresponsive, resulting in a denial of service (DoS) condition.

Mitigation

Version 5.0.1 of the cordova-plugin-fingerprint-aio doesn't export the activity anymore and is no longer vulnerable.

If you want to fix older versions change the attribute android:exported of this code snippet in plugin.xml to false:

<config-file target="AndroidManifest.xml" parent="application">
      <activity android:name="de.niklasmerz.cordova.biometric.BiometricActivity" android:theme="@style/TransparentTheme" android:exported="false"/>
</config-file>

Patches

Please upgrade to version 5.0.1 as soon as possible.

Please check out the release on GitHub.

For more information

If you have any questions or comments about this advisory please go to the discussion on GitHub.

Credits

• Kerolos A. Saber Twitter 3x3s@wearehackerone.com