Kanboard is project management software focused on Kanban methodology. Prior to 1.2.51, Kanboards user invite registration endpoint (UserInviteController::register()) accepts all POST parameters and passes them to UserModel::create() without filtering out the role field. An attacker who receives an invite link can inject role=app-admin in the registration form to create an administrator account. Version 1.2.51 fixes the issue.
Weakness
The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.
Extended Description
If the object contains attributes that were only intended for internal use, then their unexpected modification could lead to a vulnerability. This weakness is sometimes known by the language-specific mechanisms that make it possible, such as mass assignment, autobinding, or object injection.
Potential Mitigations
- If available, use features of the language or framework that allow specification of allowlists of attributes or fields that are allowed to be modified. If possible, prefer allowlists over denylists.
- For applications written with Ruby on Rails, use the attr_accessible (allowlist) or attr_protected (denylist) macros in each class that may be used in mass assignment.