A missing origin validation in WebSockets vulnerability affects the GraphicalData web services used by the WebVue, WebScheduler, TouchVue and SnapVue features of PcVue in version 12.0.0 through 16.3.3 included. It might allow a remote attacker to lure a successfully authenticated user to a malicious website.
This vulnerability only affects the following two endpoints: GraphicalData/js/signalR/connect and GraphicalData/js/signalR/reconnect.
Weakness
The product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Pcvue | Arcinformatique | 12.0.0 (including) | 15.2.13 (including) |
| Pcvue | Arcinformatique | 16.0.0 (including) | 16.3.4 (excluding) |
Extended Description
WebSockets provide a bi-directional low latency communication (near real-time) between a client and a server. WebSockets are different than HTTP in that the connections are long-lived, as the channel will remain open until the client or the server is ready to send the message, whereas in HTTP, once the response occurs (which typically happens immediately), the transaction completes. A WebSocket can leverage the existing HTTP protocol over ports 80 and 443, but it is not limited to HTTP. WebSockets can make cross-origin requests that are not restricted by browser-based protection mechanisms such as the Same Origin Policy (SOP) or Cross-Origin Resource Sharing (CORS). Without explicit origin validation, this makes CSRF attacks more powerful.