Impact

When opening a form in Valtimo, the access token (JWT) of the user is exposed to api.form.io via the the x-jwt-token header. An attacker can retrieve personal information from this token, or use it to execute requests to the Valtimo REST API on behalf of the logged-in user.

This issue is caused by a misconfiguration of the Form.io component.

Attack requirements

The following conditions have to be met in order to perform this attack:

• An attacker needs to have access to the network traffic on the api.form.io domain.
• The content of the x-jwt-token header is logged or otherwise available to the attacker.
• An attacker needs to have network access to the Valtimo API.
• An attacker needs to act within the time-to-live of the access token. The default TTL in Keycloak is 5 minutes.

Patches

Versions 10.8.4, 11.1.6 and 11.2.2 have been patched