During account assignment in the Talk2M platform, a Cosy+ device generates and sends a certificate signing request (CSR) to the back end. This CSR is then signed by the manufacturer and used for OpenVPN authentication by the device afterward. Since the common name (CN) of the certificate is specified by the device and used in order to assign the OpenVPN session to the corresponding Talk2M account, an attacker with root access to a Cosy+ device is able to manipulate the CSR and get correctly signed certificates for foreign devices.
Support the originator by clicking the read the rest link below.
